+ UF_VTKViewer = 0x00000800, //!< OCC viewer
+ UF_VTK_Init = 0x00001000, //!< initial update (used with UF_OCCViewer)
+ UF_VTK_Forced = 0x00002000, //!< to force recomputing all presentations (used with UF_OCCViewer)
+
+ UF_FitAll = 0x00000400, //!< to do fit all (used with UF_Viewer or UF_OCCViewer)
+