[SOLVED]Want to expand QTextEdit ..

Hi , I would like to expand QTextEdit which is in QGroupBox and again the QGroupBox in QStacked Widget.
Please refer the below picture
I tried all the H-Spacer & V-Spacer with H-Layout & V-layout Control..
But i am not able to expand my TextEdit control , when the main dialog window get expand by mouse
I can see only the stacked Widget alone getting expanded nothing else..
Please let me know ,whether i am doing anything wrong.

I want to have the same setup like in Qt-Creator , under project->manage ( we will be getting popup dialog window)