The groupbox itself needs a layout. If there's only one item in there (the lineedit) it doesn't really matter which kind of layout, but one is needed...
1. create a new dialog 2. put a push button 3. put a group box 4. put a lineedit in group box 5. put another lineedit in group box 6. select two lineedit and layout vertically 7. select push button and group box 8. layout vertically The same thing happens. Maybe this is only a Linux designer bug? Bo