ツリーバインドデータ後、自動的にツリーノードを展開するFlexメソッド

//Expand all, with the first item initially selected
treePlayList.dataProvider=results;//refresh all nodes of Tree to expand - royanxin - royanxin's blog
treePlayList.validateNow(); //Validate and update the properties and layout of this object, and redraw the object (if needed).
treePlayList.selectedIndex=0;
treePlayList.expandChildrenOf(treePlayList.selectedItem,true);//expand all

setTimeout(IniExpand, 1000); //delay 1 second
private function IniExpand():void {
TreeView1.selectedIndex=1;
TreeView1.expandItem(TreeView1.selectedItem,true);
}

//Expand all, with no options initially selected
sysTree.validateNow();
for each(var item:XML in this.sysTree.dataProvider){
sysTree.expandChildrenOf(item,true);
}