[vtkusers] RemoveObserver..

[John Vard]

Hi All,

Quick question regarding the removal of an observer. In my case it's the 
removal of the LeftButtonPressEvent and LeftButtonReleaseEvent. I'm 
attempting to use the RemoveObserver(command*) but am unsure what to place as 
the <command>. Is there a number associated with the above events as placing 
the string "LeftButtonPressEvent" or "LeftButtonReleaseEvent" returns an 
error requesting an integer??
-- 
Regards
John V