替换AsWing的JTree组件中的图标

    public class CollapsedFolderIcon implements Icon, UIResource{
        private var iconImg:DisplayObject;
        public function CollapsedFolderIcon(){
            iconImg = SystemImages.getJiahao2();
        }
        
        public function getIconWidth(c:Component) : int {
            return iconImg.width;
        }
        
        public function getIconHeight(c:Component) : int {
            return iconImg.height;
        }
        
        public function updateIcon(com:Component, g:Graphics2D, x:int, y:int):void {
            
            
        }
        
        public function getDisplay(c:Component):DisplayObject{
            return iconImg;
        }
        
    }

    public class ExpandedFolderIcon implements Icon, UIResource{
        private var iconImg:DisplayObject;
        public function ExpandedFolderIcon(){
            iconImg = SystemImages.getJianhao2();
        }
        
        public function getIconWidth(c:Component) : int {
            return iconImg.width;
        }
        
        public function getIconHeight(c:Component) : int {
            return iconImg.height;
        }
        
        public function updateIcon(com:Component, g:Graphics2D, x:int, y:int):void {
            
            
        }
        
        public function getDisplay(c:Component):DisplayObject{
            return iconImg;
        }
        
    }

            var ui:ComponentUI = tree.getUI();
            ui.putDefault("Tree.folderExpandedIcon",ExpandedFolderIcon);

　　　　　　　//ui.putDefault("Tree.folderExpandedIcon",new AssetIcon(xxx));错误

            ui.putDefault("Tree.folderCollapsedIcon",CollapsedFolderIcon);