[vtkusers] Disable rotation

[Koteswara Rao Ruvva]

Hello All,
I have a renderWindow that contains two renderers. In first renderer I display Polydata actor and a cut plane actor. In the second renderer, I render contours generated by the intersection of the Polydata and the cut plane. I have a Trackball style interactor for the renderWindow to deal with the mouse and keyboard events in both the renderers. Everything is good so far. 
Now I don't want to allow rotation of the camera with left mouse button in the second renderer, where contours are rendered. I need the zoom and pan, but not the rotation. How can I do it? I set the PickableOff on contour actor in order to avoid pick and drag. This solves half the problem. I still need to lock the rotation of the camera with left mouse button. 
I appreciate your suggestions.
Thank youKoteswar
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