Hi , I am picking some poits on a vtkImageActor. I want to show the picked values only when both "OnLeftButtonDown" and "OnMouseMove" occurs. How to do that? Thanks -- Jothy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20120412/31779586/attachment.htm>