here I'm posting a simple example application source that demostrates the problem:
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
private var dpHierarchy:ArrayCollection= new ArrayCollection([
{name:"Grandpa", total:70, children:[
{name:"kernel32.dll, 0x76dee0e0\n" +
"mscorwks.dll, 0x000007fef981f0bd\n" +
"mscorwks.dll, 0x000007fef9dd2ed0\n" +
"App_Web_vc6wsfpc.dll, 0x06000050\n" +
"SYSTEM.WEB.REGULAREXPRESSIONS.DLL, 0x060000a2\n" +
"SYSTEM.WEB.DLL, 0x060059e0\n" +
"SYSTEM.WEB.DLL, 0x06002db7\n" +
"SYSTEM.WEB.DLL, 0x06002db8\n" +
"SYSTEM.WEB.DLL, 0x0600309f\n" +
"SYSTEM.WEB.DLL, 0x06003098\n" +
"SYSTEM.WEB.DLL, 0x06003097\n" +
"SYSTEM.WEB.DLL, 0x06003092\n" +
"App_Web_vc6wsfpc.dll, 0x0600006a\n" +
"SYSTEM.WEB.DLL, 0x06000728\n" +
"SYSTEM.WEB.DLL, 0x06000725\n" +
"SYSTEM.WEB.DLL, 0x06000729\n" +
"SYSTEM.WEB.DLL, 0x0600072a\n" +
"App_Web_vc6wsfpc.dll, 0x06000013\n" +
"SYSTEM.WEB.DLL, 0x060040a7\n" +
"SYSTEM.WEB.DLL, 0x060040aa\n" +
"SYSTEM.WEB.DLL, 0x06003048\n" +
"SYSTEM.WEB.DLL, 0x0600309f\n" +
"SYSTEM.WEB.DLL, 0x06003098\n" +
"SYSTEM.WEB.DLL, 0x06003097\n" +
"SYSTEM.WEB.DLL, 0x06003092\n" +
"App_Web_vc6wsfpc.dll, 0x0600004d\n" +
"SYSTEM.WEB.DLL, 0x06000226\n" +
"SYSTEM.WEB.DLL, 0x060001d6\n" +
"SYSTEM.WEB.DLL, 0x06000242\n" +
"SYSTEM.WEB.DLL, 0x060001e8\n" +
"SYSTEM.WEB.DLL, 0x0600069d\n" +
"SYSTEM.WEB.DLL, 0x060021f1\n" +
"SYSTEM.WEB.DLL, 0x060021f0\n" +
"SYSTEM.WEB.DLL, 0x06000000\n" +
"SYSTEM.WEB.DLL, 0x000007fef4bb6c34\n" +
"mscorwks.dll, 0x000007fef998b07a\n" +
"WEBENGINE.DLL, 0x000007fef0134f27\n" +
"WEBENGINE.DLL, 0x000007fef0135fb9\n" +
"WEBENGINE.DLL, 0x000007fef013182e\n" +
"WEBENGINE.DLL, 0x000007fef0131e94", total:130},
{name:"Joe Smith", total:229},
{name:"Alice Treu", total:230}
]}
]);
]]>
</mx:Script>
<mx:AdvancedDataGrid id="myADG"
width="100%" height="100%"
variableRowHeight="true">
<mx:dataProvider>
<mx:HierarchicalData source="{dpHierarchy}"/>
</mx:dataProvider>
<mx:columns>
<mx:AdvancedDataGridColumn dataField="name" headerText="Name"/>
<mx:AdvancedDataGridColumn dataField="total" headerText="Total"/>
</mx:columns>
</mx:AdvancedDataGrid>
just copy this code and run it in Flex IDE, try to change the browser's height and you'll see that you cannot view the whole value of the node with the long string value!, the scroll jumps to view the next nodes.
Any idea?!