[flexcoders] Auto expand TreeView on open - How?

[pbrendanc]

I want to auto expand my menu treeview immediately on open - the
following code is called from thecreationComplete="initTree();" and
expands the first node only. 

Is there a way to expand all nodes - I can't seem to get this to work.
(Other have reported problems so I wonder if this is supported)?

TIA,
Patrick

(The data provider for the tree is an XMLList)

        <mx:XMLList id="menuData" >     
        <node label="Data Management">
                <node label="Registration"/>
                <node label="Customer List"/>
        </node>
        <node label="System Administration">
                <node label="Add Users"/>
        </node>         


private function initTree():void {
                                
//Expands first visible Tree Item
menuTree.expandItem(menuTree.firstVisibleItem,true);  
}