Tree with custom labels crashes during scrolling

We have a tree that uses custom icons for different
folder/data types. The tree contains about 150 items of around 15
types. The icons are assigned correctly and the tree works just
fine.
However: If we scroll the tree up and down, it eats up some
resource, and after a couple of seconds of constant back and forth
scrolling the app hangs up completely.
The icons are embedded btw. If we don's use custom icons,
then we don't get a crash here.
Any idea what's going wrong here? What can be done to fix it?
Thanks
Klaus
P.S. To create the we use a label function like this:
public static function treeLabel(item:Object):String
var node:XML = XML(item);
var cType:String = [email protected]();
if(Assets.getInstance().hasOwnProperty("icon"+cType))
var icon:Class = Assets.getInstance()["icon"+cType];
_application.portalTree.setItemIcon(node, icon, icon);
return [email protected]();

Ok, just to answer this question myself:
Don't set icons in the labelFunction. The proper and only way
to do this is to use the iconFunction inherited from the list
control!
Klaus

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