Flex tree 双击展开收起节点，更改图标设置

首先设置tree属性?doubleClickEnabled="true"

doubleClickEnabled="true"
itemDoubleClick="openOrClose()"

private function openOrClose():void {
    var node:XML = tree1.selectedItem as XML;//获取当前选中的节点并强转
    var isOpen:Boolean = tree1.isItemOpen(node);
    tree1.expandItem(node,!isOpen);
}

更改图标的属性：
?defaultLeafIcon="{fileInfo}"
?folderOpenIcon="{folderOpen}"
?folderClosedIcon="{folderClose}"

[Bindable]
[Embed(source="images/open.png")]
public var folderOpen:Class;
			
[Bindable]
[Embed(source="images/close.png")]
public var folderClose:Class;
			
[Bindable]
[Embed(source="images/file.png")]
public var fileInfo:Class;