[vtkusers] How to get mouse button details from vtkInteractorStyleImage

[K O ranjith]

Hello,
I'm inheriting  vtkInteractorStyleImage for customizing mouse events in an
image viewer.
In vtkInteractorStyleImage, have any method to get the details of which
mouse button is pressed(Left/ Right/Middle) like GetKeySym() for keyborad
 keys.
I know about the virtual functions like OnRightButtonDown
<http://www.vtk.org/doc/nightly/html/classvtkInteractorStyle.html#a41fd8967b8537a29e68d614990006ee1>
 ().
Have any direct way to get from the vtkInteractorStyleImage  object...?
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