title: How do I change the expand/collapse icon on a Telerik winform Treeview?
body: <p>I'm trying to customise the expand/collapse icon on a Telerik Winform TreeView control. </p>
  
  <p>If I populate a TreeView control with the PropertyBuilder, I can see Telerik.WinControls.UI.ExpandCollapseElements which I can modify to change the expand/collapse icons. However I want to populate my tree dynamically. </p>
  
  <p>I have examined modifying the theme but I don't see ExpandCollapseElements anywhere in Visual Style Builder, nor do I see any way to modify these icons at the RadTreeView end of the object model. </p>
  
  <p>Screenshots say it can be done, but what am I missing? </p>