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From Jason Guild <jason.gu...@alaska.gov>
Subject problem with mx:DataGrid and custom itemRenderer using view states
Date Tue, 15 Jul 2014 00:57:49 GMT
Hi All:

I've encountered an intermittant stack overflow problem displaying data 
in an <mx:DataGrid> with two colunms, variableRowHeight="true", and a 
custom itemRenderer applied to the second column. The item renderer for 
the second column is based on <mx:Box> and has two view states. The 
renderer is either in the "default" state and shows wrapped text, or in 
a "link" state and the text is a hyperlink where an <mx:Button> to be 
displayed instead.

My interface combines an <mx:Tree> beside an <mx:DataGrid> in a simple 
master/detail configuration. Selecting an item in the tree resets the 
grid dataProvider to show detailed data in the grid for the 
corresponding tree item. The MXML for the interface is:

<mx:DividedBox id="resultsBox" width="100%" height="100%" 
direction="horizontal">
     <mx:Tree id="resultTree" width="37%" height="100%" minWidth="100"
              styleName="layerTreeStyle"
              doubleClickEnabled="true"
              dataProvider="{ viewModel.results }"/>

     <mx:DataGrid id="attrGrid"
                  width="63%"
                  minWidth="125"
                  height="100%"
                  variableRowHeight="true"
                  draggableColumns="false"
                  sortableColumns="false"
                  editable="false">
         <mx:columns>
             <mx:DataGridColumn headerText="Field" dataField="field" 
width="100"/>
             <mx:DataGridColumn headerText="Value" dataField="value" 
width="125"
  itemRenderer="views.renderers.ResultSummaryValueRenderer"/>
         </mx:columns>
     </mx:DataGrid>
</mx:DividedBox>

The itemRenderer looks like this:

<?xml version="1.0" encoding="utf-8"?>
<mx:Box xmlns:fx="http://ns.adobe.com/mxml/2009"
         xmlns:mx="library://ns.adobe.com/flex/mx"
         implements="mx.core.IDataRenderer"
         width="100%"
         paddingLeft="5">

     <fx:Script>
         <![CDATA[
             import events.ResultLinkEvent;
             import mx.events.FlexEvent;
             import util.StringUtil;

             private const linkMethodPat:RegExp = /(ht|f)tp(s?):/i;

             private var _data:Object;

             [Bindable]
             private var displayVal:String = null;
             [Bindable]
             private var displayTip:String = null;

             [Bindable("dataChange")]
             public override function get data():Object {
                 return _data;
             }

             public override function set data(value:Object):void {

                 if ((this._data = value) != null) {
                     if (isLink(value)) {
                         var valStr:String = data.value as String;
                         var sepIndex:int = valStr.indexOf("|");

                         this.displayVal = (sepIndex >= 0) ? 
valStr.substring(0, sepIndex) : "Link";
                         this.displayTip = valStr.substring(sepIndex + 1);
                         this.currentState = "link";
                         return;
                     }

                     this.displayVal = ("value" in data && 
StringUtil.isNotBlank(data.value)) ? data.value : "[ no value ]";
                     this.displayTip = null;
                     this.currentState = "default";
                 }

                 dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
             }

             private function isLink(attrInfo:Object):Boolean {
                 var sepIndex:int = attrInfo.value.indexOf("|");
                 var attrVal:String = (sepIndex == -1) ? attrInfo.value 
: String(attrInfo.value).substring(sepIndex);

                 // return true if value is URL with recognized method
                 return (attrVal.substring(0, 
attrVal.indexOf('//')).match(linkMethodPat) != null);
             }

             private function notifyLink(evt:MouseEvent):void {
                 var attrVal:String = data.value as String;
                 var sepIndex:int = attrVal.indexOf("|");

                 dispatchEvent(new ResultLinkEvent(
                     ResultLinkEvent.NAVIGATE,
                     data.field,
                     (sepIndex == -1) ? attrVal : 
attrVal.substring(sepIndex + 1)
                     )
                 );
             }
         ]]>
     </fx:Script>

     <mx:states>
         <mx:State name="default"/>
         <mx:State name="link"/>
     </mx:states>

     <mx:Text id="attrTextCtrl" width="100%"
              text="{ displayVal }" selectable="true" excludeFrom="link"/>
     <mx:Button id="attrButtonCtrl" label="{ displayVal }" toolTip="{ 
displayTip }"
                click="notifyLink(event)" includeIn="link"/>
</mx:Box>

THE PROBLEM:
At first, when the tree selection changes the grid updates correctly 
with new grid content and content is displayed in the second column as 
either wrapped text or button as desired. But after an indeterminate 
number of tree selection changes the player will freeze and result in 
layout-related stack overflow of some kind.

The grid dataProvider always has about 6-12 rows, but the content itself 
varies somewhat in how many of those rows have text long enough to wrap 
in the grid when tree selection changes. There is nearly always more 
content than can be displayed vertically so the grid has to display a 
scroll bar.

I wrote that the stack overflow is intermittant because it /seems/ that 
if the grid content can be displayed completely without need for a 
scroll bar then the problem does not occur. This is often the case when 
there is only one row requiring text wrapping in the itemRenderer.

Anyway, stack traces I have (see below) indicate some kind of loop that 
occurs attempting to validate and update the display lists of the grid 
and the item renderer used until stack is exhausted. Seems like a bug.

Things I've tried to workaround the problem:
1. setting horizontalScrollPolicy="off" verticalScrollPolicy="off" 
inside item renderer -> no effect, problem persists
2. basing itemRenderer on <s:MXDataGridItemRenderer/> with no layout 
instead of <mx:Box/> -> problem persists
3. basing itemRenderer on <s:MXDataGridItemRenderer/> with 
<s:HorizontalLayout/> instead of <mx:Box/> -> problem persists
4. setting variableRowHeight="false" on grid -> problem eliminated, but 
long text is not wrapped (undesired visual outcome)
5. removing itemRenderer on second column -> problem eliminated, but is 
effectively equivalent to variableRowHeight="false" because default
DataGridItemRenderer class never wraps text (undesired visual outcome).
6. Using a bare minimum itemRenderer based on <mx:Box/> involving only 
<mx:Text> for wrapped text and no view states -> problem eliminated, but 
its not possible to display a button when content is a hyperlink.
7. Using an itemRenderer based on <mx:Box/> that avoids view states 
altogether and tries to toggle which control is visible through setting 
of visible and includeInLayout -> seemed better at first, but problem 
persists
8. I also tried to extend DataGridColumn to conditionally use two 
different itemRenderers based on the data, but 
DataGridColumn.getItemRendererFactory() calls private methods I can't 
override without bringing the whole class into my tree.

QUESTIONS:
1. Is there another way to write an item renderer with switching view 
states in a way that is more robust?
2. How does <mx:DataGrid> compute the needed height for a row? Can I 
break the chain somehow by implementing measure() or something?

Any help or suggestions would be greatly appreciated!!!
Jason

P.S. STACK TRACES:
itemRenderer based on mx:Box --
undefined
     at 
mx.core::LayoutElementUIComponentUtils$/getPreferredUBoundsHeight()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:92]
     at 
mx.core::LayoutElementUIComponentUtils$/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:510]
     at 
mx.core::UIComponent/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:14474]
     at 
spark.layouts::BasicLayout/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/layouts/BasicLayout.as:508]
     at 
spark.components.supportClasses::GroupBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1302]
     at 
spark.components::Group/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1179]
     at 
mx.core::UIComponent/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:9531]
     at 
spark.components::Group/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1101]
     at 
mx.managers::LayoutManager/validateClient()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1041]
     at 
mx.core::UIComponent/validateNow()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8609]
     at 
mx.controls.dataGridClasses::DataGridBase/updateRendererDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1344]
     at 
mx.controls.dataGridClasses::DataGridBase/drawItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1309]
     at 
mx.controls.dataGridClasses::DataGridBase/drawVisibleItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1282]
     at 
mx.controls.dataGridClasses::DataGridBase/makeRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:818]
     at 
mx.controls.dataGridClasses::DataGridBase/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:702]
     at 
mx.controls::DataGrid/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1882]
     at 
mx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:1747]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4388]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]

itemRenderer based on s:MXDataGridItemRenderer:
undefined
     at 
mx.managers::LayoutManager/invalidateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:556]
     at 
mx.core::UIComponent/invalidateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8433]
     at 
mx.core::UIComponent/setActualSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:10250]
     at 
mx.core::LayoutElementUIComponentUtils$/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:519]
     at 
mx.core::UIComponent/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:14474]
     at 
spark.layouts::BasicLayout/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/layouts/BasicLayout.as:508]
     at 
spark.components.supportClasses::GroupBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1302]
     at 
spark.components::Group/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1179]
     at 
mx.core::UIComponent/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:9531]
     at 
spark.components::Group/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1101]
     at 
mx.managers::LayoutManager/validateClient()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1041]
     at 
mx.core::UIComponent/validateNow()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8609]
     at 
mx.controls.dataGridClasses::DataGridBase/updateRendererDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1344]
     at 
mx.controls.dataGridClasses::DataGridBase/drawItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1309]
     at 
mx.controls.dataGridClasses::DataGridBase/drawVisibleItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1282]
     at 
mx.controls.dataGridClasses::DataGridBase/makeRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:818]
     at 
mx.controls.dataGridClasses::DataGridBase/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:702]
     at 
mx.controls::DataGrid/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1882]
     at 
mx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:1747]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4388]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]
     at 
mx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]
     at 
mx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]
     at 
mx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]
     at 
mx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]
     at 
mx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]


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