A child widget turns up as a new window

[bnilsson]

I create a QWidget subclass and supply a group box in my main window as a parent to it in the creation. Still, it turns up as a free window next to my main window.
Am I doing a common mistake that any of you have done before?
Any suggestions what I should look for?

BN

[JimDaniel]

From what you describe I would make a layout, add the widget subclass to the layout, then set the layout to the groupbox. I believe that's the preferred way of putting widgets inside a groupbox. Haven't really used them that much.