gtk:window-hide-on-close (object)

object -- a gtk:window widget
setting -- a boolean whether the window should be hidden when the users clicks the Close button

Accessor of the hide-on-close slot of the gtk:window class. The gtk:window-hide-on-close function returns whether the window will be hidden and not destroyed when the close button is clicked. The gtk:window-hide-on-close function sets the property.