If you replace the icon in a subclass, you'll have to remove the old one from the display list and add your new one (removeChild/addChild).
Tree has APIs for getting the renderer to choose different icons depending on the data. See Tree styles like defaultLeafIcon, and APIs like iconField You may not need a custom renderer if all you want to change is the icon From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of dfrank76 Sent: Tuesday, November 11, 2008 11:32 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] TreeItemRenderer setting an icon to an embedded image What is the proper way to set the icon from a TreeItemRenderer when using an embeded graphic file? I don't want to accidentally create hundreds of instances of it in memory. TreeItemRenderer.icon is an instance of IFlexDisplayObject which is implemented by BitmapDataAsset (the embedded graphic class). When I do the following: public class MyTreeItemRenderer extends TreeItemRenderer { [Embed(source="../../assets/test.jpg")] public var testIcon:Class; public function MyTrereItemRenderer() { super(); } // Override the updateDisplayList() method // to set the text for each tree node. override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void { super.updateDisplayList(unscaledWidth, unscaledHeight); this.icon = new studentIcon(); } } I get this RTE: ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller. at flash.display::DisplayObjectContainer/removeChild() at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::$remo veChild() at mx.core::UIComponent/removeChild() at mx.controls.treeClasses::TreeItemRenderer/commitProperties() at mx.core::UIComponent/validateProperties() at mx.managers::LayoutManager/validateClient() at mx.controls::List/makeRowsAndColumns() at mx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows() at mx.controls.listClasses::ListBase/updateDisplayList() at mx.controls::List/updateDisplayList() I can't seem to find a good example of a TreeItemRenderer on the web that uses the icon field to control the icon. Dave
