Flex - Changing ItemRender Dynamically

Create a new private variable. itemRendererClassFactory

// Handle to our item renderer class factory so we don’t have to always create new one.

private var _itemRendererClassFactory:ClassFactory = new ClassFactory();

private function changeItemRednerer(multiSelect:Boolean = false):void

                     {

                           if(Condtion to Apply Renderer)

                                  _itemRendererClassFactory.generator = ItemRenderer1;

                           else

                                  _itemRendererClassFactory.generator = ItemRenderer2;

                          

                           _listTree.itemRenderer = _itemRendererClassFactory;

                           _listTree.validateNow();

                     }