hi,
I desinged a toolbox and put onto a tabwidget page (here the toolbox isn't blocked in any point); I create an instance of a myWidget class in mymainform class and I put this widget on left of toolbox; the I managed layout by hand from mymainform (layout horizotal/vertical); maybe is betterfix the layout in designer putting on the left of toolbox a Qframe??? (then in mymainform I can put mywidget inside frame)....thanks