title: Wpf: Treeview updated or datatemplate applied event
body: <p>The scenario is: In my Window, I have a TreeView; each item of this represents different user-defined types. So I have defined DataTemplate for each type. These DataTemplates are using user-controls and these usercontrols are binded with properties of user-defined types. As simple, TreeView maps a Hierarchical Data Structure of user-defined types.</p>
  
  <p>Now I read from XML and create the Hierarchical structure and assign it to TreeView and it takes a lot of time to load. It already has some default nodes and updates itself for other nodes.</p>
  
  <p>I want to show a wait cursor until it get loaded and available to use for user, but I am not getting any event to notify me this. Is there any such event? What else can I do?</p>