GuiTreeViewCtrl

I'm having trouble using the new 1.4 version of GuiTreeViewCtrl.

This is what I'm doing,
editortree.insertitem(0, "New", "New", "Item"); // That should use the default Item icon

All I get is the new item, with no icon.

If I do this,
editortree.insertitem(0, "New", "New", "New", 10);

Then it creates the sun icons, or icon associated with the number.

In editor.cs you appear to do it the way need it done.
%this.insertItem(%grp, %obj.getName(), %obj.getClassName() @ "::create(" @ %obj.getName() @ ");","Item");

By looking at getIcon

S32 GuiTreeViewCtrl::getIcon(const char * iconString)
{
   S32 icon = Default;
  ....
   else if (!dStrcmp(iconString, "Item"))
      icon = Shape;
  ....
}

It looks like I can use a string and have no need for a number.

Anyway what I'm trying to do is create items on the fly, and associate a new image with it.
Something like this editortree.insertitem(0, "MyNewItem", %Id, %icon); , I would want %icon to be able to point to any icon in a my folder. Any ideas, comments or fixes.