[vtkusers] Add a menu item to a vtk window

[brandorama]

Hi,
i would like to add features to a vtk window. In this window i show  a point cloud and i want to add a menu that appers on rigth mouse click.
Someone can tell me how can i do?
For exemple if vtk library include menu feature or if i have to include other libraries.

Thanks!
Andrea Brandorama
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