How to remove window from a group?

[MaciekLeks]

As in the subject. I dig in the Internet and here and I cannot find answer to that I suppose simple question?

[Tc14Hd]

Here is the solution that I found, although it's not very pretty:
When you have a group of windows and you want to remove one window from the group, use your mouse cursor to drag the particular window to another position on the screen (just as you normally move windows around the screen). This should remove the window from the group.