[vtkusers] vtk AddObserver question

[hp.shen]

Hi,all
 
If we create codes without GUI, vtk can reponse to user defined events
such as:
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin
iren AddObserver LeftButtonPressEvent userLBtnPressed
.
proc userLBtnPressed {} {
.
}
 
While, if building a tcl GUI, we can't use
iren SetRenderWindow renWin
anymore. So now how can we define our own events?
 
Thanks in advance.
 
peace
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