1) I'd like to have a single NTreeList with three views showing either a list of nodes, nodes grouped by column 6, or nodes grouped by column 7.  It doesn't appear the NTreeList.GroupBy method supports this.  When I call it with null or on a different column it doesn't work as desired.  It seems once I call GroupBy I can never call it again on that NTreeList.  I found no way to refresh the NTreeList even if I cleared everything first.  The only solution I can think of is to have multiple NTreeList widgets for each view.  I've tried every way of calling GroupBy and EnableGroupBy I can think of to make this work.  Is there a way I can do what I want with a single NTreeList?

2) When I successfully call GroupBy I noticed my group node's height is taller than the other nodes.  Is there a way I can change the height of the group node?