In the following code, the scrollbar for sourcelist does not appear. I tried to set scroll policy to on. The scrollbar appeared, but it was not active.
<s:HGroup width="100%">
<s:RadioButton id="linreflistbu" groupName="listgroup"/>
<s:List id="linereflist" dataProvider="{upent.linereferencelist}" click="linereflist_clickHandler(event)" width="40%"
height="40%"
dragEnabled="true" itemRenderer="renderers.nobelrenderer2" />
<s:RadioButton id="treelevelslistbu" includeIn="mainstate" groupName="listgroup"/>
<s:List id="treelevellist" width="60%"
dataProvider="{upent.nobel}" includeIn="mainstate" itemRenderer="renderers.nobelrenderer2" height="30%"
dragDrop="true" dropEnabled="true" />
<s:RadioButton id="resourcelistbu" includeIn="sourcestate" groupName="listgroup"/>
<s:List id="sourcelist" dataProvider="{upent.sourcelist}"
creationComplete="sourcelist_creationCompleteHandler(event)"
changing="sourcelist_changingHandler(event)" itemRenderer="renderers.resourcerenderer" height="30%"
width="40%" includeIn="sourcestate"/>
</s:HGroup>