If someone can show a sample subclass that ignores the event, it'll be easier to see what's going on. The code in sceneEvent() is for filtering away enter and leave events for items that handle child events - it's a special thing for hover events to let you track the mouse motion over all children, avoiding having to check whether enter and leave events were for the parent or the child, or whatever :-). Hover events and mouse events are handled differently, though...