The treeview GUI has several methods, etc. that expect input as a treenodes and give output as treenodes. If my new class uses Biggertreenodes instead of treenodes, the methods don't work.

I have a C#.Net Windows.Forms application with a main form that is an MdiContainer. I have a TreeView docked (actually on a panel that is docked) to the left, and I open up a variety of MDI child ...