You may use this method to set whether the child window of the event box will be visible or not. An invisible child window will only receive events and nothing else. However if the child window is visible, it will act as a parent window for the widget that was added to the event box.
You may make the child window invisible if you wish to trap events only. Visible child windows are useful when you want to set the background for the box to a different color or draw on it.
The default behavior is to make the child window visible. You may pass false as a parameter to the method if you wish to make the window invisible.
See also: get_visible_window()