[vtkusers] transforming objects due to user interaction II

[Bauer Harald]

Dear VTK Users, 
(Info: I'm using vtk4.0 with C++)
can anyone tell me how to transform an object due to arbitrary user interaction ??
To be sure that the problem is ok - in more detail: 
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It's easy to visualize objects in a vtkRenderWindow. 
Moreover, it's easy to enable a vtkRenderWindowInteractor to enable user interaction (rotation, zooming, ..)
Is there also a (simple) way to transform the visualized object according to the interaction actions 
when closing the window for example ???
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I hope, that - even if it may be a very easy question - someone can give me an answer; 
best would be a short programming example ;-)
Greetings, 
Harry