[vtkusers] rubber band selection question

[Wayne Christopher]

I am using vtkInteractorStyleRubberBandPick to select objects in a 
region (I'm getting the bounding planes and doing the selection in my 
own data structures).  I would like to also support picking a single 
location - if the user releases the mouse without moving more than a 
pixel or two, I want to get a vector rather than a frustrum.  
vtkInteractorStyleRubberBandPick explicitly ignores the case where the 
mouse does not move, though.

What's the best way to do this?  Do I have to set up extra observers for 
mouse down and up, or something like that?

Thanks for any help,

     Wayne