Recuce boundary space in QGroupBox/QFrame

http://img528.imageshack.us/img528/2279/panelxj.th.jpg
How to reduce boundary space (horizontal/vertical) in QGroupBox?

The button are added in a horizontal layout and then layout has been set for GroupBox.

Code:

---

self.horizontalGroupBox.setLayout(layout)

---

This is also relevant for QFrame. It also takes some extra space as visible in the image.

QLayout::setContentsMargins() and QWidget::setContentsMargins().

And please attach images here at the forum that your post stays consistent.