void set_above_child(bool above_child
You may use this method if you wish to position your event box above
the window of its child, as opposed to below it. As mentioned before,
if the window is above, all events received inside the event box will
go to the event box itself. However is the window is positioned below,
events in the window of the child will first go to that widget and then
to its parents.
The default keeps the window below the child. You may pass
true as a parameter to this method to position the
window above the child.