title: Styling different levels of a WPF treeview differently?
body: <p>I have a very flat-structured treeview with only two levels of items - the main ones, and one level of subitems. I am using WPF MVVM and would like a way to style the two levels differently, but have no idea how.</p>
  
  <p>I bind the treeview to an ObservableCollection in my ViewModel, and each element has one more ObservableCollection for the next level.</p>
  
  <p>Any help?</p>