I have been playing around with this all day and have given up.
Based off the level of the treeview, I would like to change the expander line color. I tried to add a style to my ToggleButton x:Name="Expander" line in the RadTreeViewItem template figuring that would work but has no success.
I so far have only been able to change the expander for the entire treeview in the main treeview control.
Thanks for the help