QGLWidget problem

[high_flyer]

These "flowing layouts" are QWidgets. In such case the main widget doesn't have any layouts set.

Well, not according to the designer object browser on the right.
Try it:
Place 4 buttons on a widget.
Select 2 of the buttons, and but them in a VBox layout.
The other 2 on a another layout.
No new widgets are to be seen on the object manager.
That was my question - how designer implements this case.
But I find it hard to beive that it create a new widgets for the layouts...
See image.