ImageEngine/gaffer — pull request #568 by bentoogood (2013-10-01 22:06:04+00:00)
Title: adds ability to specify the widget to be grabbed.

useful for capturing pop-up dialogues.
example in cmdfile :
```
cc = GafferUI.ColorChooserDialogue()
cc.setVisible(True)
application.setGrabWidget(cc)
```