Flex SDK 3.4 Tree Item Renderer Root Folder displays Tooltip for Child

Question

I have a Flex Tree that uses a custom item renderer.  The item renderer extends Tree Item Renderer and I add my button in commit properties (since the data is dynamic) and I use update displaylist to move it to the right position.  I set the button to be visible on rollover and make the icon invisible. On rollout I reverse that logic.
When I have my item renderer add the button, it causes only one problem and it seems to be under certain conditions:
- Single root folder for the tree
- Upon opening the tree, the root folder displays the tool tip for the last child in the tree
Any idea why the tooltip comes up?
public function AssetTreeItemRenderer ()
            super();
            addEventListener(MouseEvent.ROLL_OVER, onItemRollover);
            addEventListener(MouseEvent.ROLL_OUT, onItemRollout);
            addEventListener(ToolTipEvent.TOOL_TIP_SHOWN, toolTipShown);
            addEventListener(ToolTipEvent.TOOL_TIP_CREATE, onCreateToolTip);
        // OVERRIDEN FUNCTIONS
         * override createChildren
        override protected function commitProperties():void {
            super.commitProperties();
            if(data is IAsset) {
                if(playBtn === null) {
                    playBtn = new Button();
                    playBtn.styleName = "previewPlayButton";
                    playBtn.toolTip = "Play";
                    playBtn.width = icon.width + 2;
                    playBtn.height = icon.height + 2;
                    playBtn.visible = false;
                    playBtn.addEventListener(MouseEvent.CLICK, onPlayBtnClick);
                    addChild(playBtn);
            } else {
                if(playBtn !== null) {
                    removeChild(playBtn);
                    playBtn = null;
         * override updateDisplayList
         * @param Number unscaledWidth
         * @param Number unscaledHeight
        override protected function updateDisplayList(unscaledWidth:Number,
                                                      unscaledHeight:Number):void
            super.updateDisplayList(unscaledWidth, unscaledHeight);
            //Move our play button to the correct place
            if(super.data && playBtn !== null)
                playBtn.x = icon.x;
                playBtn.y = icon.y;

Answer 1

You are not clearing tooltip if data is not IAsset