[vtkusers] callback function is called only once

[Khan]

Hi,
I have a problem with callback function I have added observer for :

vtkCommand::LeftButtonPressEvent
vtkCommand::LeftButtonReleaseEvent
vtkCommand::MouseMoveEvent

if it is once called for *LeftButtonPressEvent* it is not called again 
I also *intitialize * and *start * my interactor after
*LeftButtonPressEvent*
if I do not  *intitialize * and *start * my callback function is called
again and again but I can not move my objects in widget.

kindly help me in this regard.

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