using onAction() for built in window

I am running my script on load of MyVideoNav.xml, and in my script i am getiing the window object by,

myWindow = xbmcgui.Window(10025)

Now I want to receive all actions coming to this window.
how can I use onAction() ?

when I write:
myWindow.onAction()
the xbmc freezes.

Thanks for help in advance.