qt design issue

i'm trying to design interface like this one http://www.softpedia.com/screenshots/FlashFXP_2.png

i'm using the QT design and programming with python well on the left it's a treeWidget but what is on the right side ? as everytime i change the cursor on the tree all widgets replace...

thanks :p

From stackoverflow

• Use QStackedWidget. You insert several widgets which correspond to the pages. Changing the active item in tree should switch the active widget/page inside the stacked widget.