I have an odd problem involving Ctreectrl. When I add the TVS_DISABLEDRAGDROP flag to my
Ctreectrl creation, OnLButtonUp gets called as expected. But, when I remove it,
OnLButtonUp doesn't get called anymore.
More specifically, OnLButtonUp works, but only after a drag and drop operation.
It no longer works for checked boxes.
Is there some buried MFC function that steals it, when drag and drop is enabled?
How do I get it back for checked boxes?

