I tried with QT 5.5.1 with the same results. Have anyone had success overlaying QT Widgets on a QVTKWidget on Mac OS? -- View this message in context: http://vtk.1045678.n5.nabble.com/QT-Button-on-top-of-QVTKWidget-Mac-OS-tp5740828p5740845.html Sent from the VTK - Users mailing list archive at Nabble.com.