[vtkusers] How to set :Selecting the vtkImagePlaneWidget widget the left button?

[ljp19890525]

Hi,
As we know vtkImagePlaneWidget widget can be Selected with the middle mouse button with and without holding
 the shift or control keys enables complex reslicing capablilites.But I want change the Selecting button ,I would prefer to the left button,So How should I do for Selecting vtkImagePlaneWidget widget with left button?
Thanks SO much! 
 http://www.vtk.org/doc/release/5.0/html/a01567.html




ljp19890525
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