gtk:widget-parent-window (widget)

widget -- a gtk:widget object
window -- a gdk:window parent window

Accessor of the parent window of the widget. The gtk:widget-parent-window function gets the parent window of the widget. The (setf gtk:widget-parent-window) function sets a non default parent window for the widget.

For gtk:window classes, setting a parent window effects whether the window is a toplevel window or can be embedded into other widgets. For gtk:window classes, this needs to be called before the window is realized.