[vtkusers] Mouse Event Problem

[Bear Neural]

Hello all,

I need some helps on the mouse event. How can I perform the my derived 
OnLeftButtonDown continually from vtkInteractorStyleTrackballCamera until I 
release the left mouse button? Currently, my problem is that it only 
performs the method once when I hold the left button. I need to release the 
button and click again to call the OnLeftButtonDown method again.

Thank you so much in advance,
Bear

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