Assigning shortcut to restore a window in KDE

In the Keyboard Shortcut window of Control center, there is no entry for Restore Window. They have entries for move window, close window, raise window, lower window .... etc.

I want to assign a shortcut for restoring a window. By Restoring the size and the position of the window should be restored to its previous state.

Anybody knows how to do this??

Thanks,

Rave.

PS: Sorry if this has already been answered some where else. I did a search and could not find it.

I have read some where that you can change the XConfig file and place a shortcut for any key combination. Can some one tell me what exactly to do?