[PySide] sliding widgets into position

[Frank Rueter | OHUfx]

Hi,

end of day for me and my brain has gone numb, so I'm probably missing 
the obvious:

I'm trying to create a widget with three areas: top, middle and bottom 
(using QFrames as place holders for now).
The middle frame is meant to be visible from the start containing some 
text and other widgets, when the button is pushed, the top frame is 
meant to slide down into view and the bottom frame is meant to slide up 
into view, so that I'm left with a controllable vertical arrangements of 
those three frames.
Here is my ugly attempt so far:
http://pastebin.com/index/bNJ9zeUm

Things do move but I can't control the start and end positions properly 
and the GridLayout adjusts itself when showing the extra frames, so that 
the middle frame jumps. I have no idea how to set the size hints etc. to 
define the start and end positions of the sliding QFrames generically 
and avoid the jumping middle frame (might have to go with an alternative 
approach to QGridLayout?!).

Any help would be greatly appreciated.

Frank