[vtkusers] Render window

[N Smethurst]

Tuhin,

Please forgive my relative ignorance here.. Maybe I have not understood 
properly. I presumed before that when a vtkRenderWindow object's reference 
count is reduced to zero, it destroys itself and any baggage that it 
created when it was born. Now, after our previous discussion, I'm thinking 
that this is not the case and possibly explains why my app leaks memory on 
every renderwindow closure.

If I am understanding what has been said, then surely it goes against the 
entire principle of c++ that an object is not responsible for it's own 
baggage? If vtkRenderWindow creates support objects for itself that are not 
independant entities (i.e. they should never exist beyond the existance of 
vtkRenderWindow), surely it should be responsible for the deletion of these 
objects?

Nick