When I change project groups, I want NB to have remembered the projects and folders that I had expanded in the explorer
when I last closed that project group and restore them to the same state when I return to that project group.  

Currently when I return to a project group all projects in it are displayed unexpanded.  I have to expand them again
myself to return to the previous state.  

I really like the project groups feature, and very often I have to jump among several different ones.  It would be a big
help in re-establishing my "mental context" (what I was in the middle of doing the last time in a given project group)
if the IDE would restore this state for me.