When QwtPlot3d SurfacePlot widgets are placed into QMdiArea there are strange things happening:
when i increase the size of my SurfacePlot subwindow, when i try to rotate the surface by my mouse it hangs up nearly 10-20 seconds. Also, when another SurfacePlot widget is under my current SurfacePlot Widget, the replotting doesn't work correctly: it does not replot the part that is NOT occupied by the widget behind for 10-20 seconds. What can i do?