QTreeView: auto-resize

[papillon]

I have a QFrame containing multiple QTreeViews, layed in vertical order. I'd like to set up things so that when, for example, QTreeView2 is expanded, the QTreeViews below it would move further away so that they do not overlap.
Maybe this image will explain better what I need to do:

qtrees.jpg

Probably using a QGridLayout and putting each QTreeView into each grid cell? Thanks