Qt-designer : Problems with splitters

[aCOSwt]

I get the following layout :

• an upper Horizontal layout A
• a lower Horizontal layout B

I can make an horizontal splitter between A and B

But now, in B, I get 3 vertical layouts D,E and F in that order from left to right.

• D gets 3 groupboxes
• E gets 1 widget and 1 treewidget
• F gets an mdiArea and a listviewwidget.

I would like to make a vertical splitter between E and F but cannot figure out how to do this, if I select both E and F and select the Lay Out entry of the context menu, the layout vertically in splitter option is dimmed.

[aCOSwt]

OK, sorry for the noise. I think I managed.

It works if I first define the vertical splitter between E and F and second, define the horizontal splitter between A and B.
Not the other way round as I had done.