Thanks! It works perfectly. I did following vtkSmartPointer<vtkInteractorStyle> m_ImageStyle = vtkInteractorStyle::SafeDownCast(m_pQVTKIren->GetInteractorStyle()); -- View this message in context: http://vtk.1045678.n5.nabble.com/Release-button-event-doesn-t-tp4661878p4665365.html Sent from the VTK - Users mailing list archive at Nabble.com.