private function tree_expandItem(evt:MouseEvent):void { if (tree.selectedItem && tree.dataDescriptor.isBranch(tree.selectedItem)) { tree.expandItem(tree.selectedItem, checkBox.selected); } } private function tree_expandChildrenOf(evt:MouseEvent):void { if (tree.selectedItem && tree.dataDescriptor.isBranch(tree.selectedItem)) { tree.expandChildrenOf(tree.selectedItem, checkBox.selected); } }