How to know the event that mouse click on a EditorGUILayout.ObjectField(...)?

I draw a EditorGUILayout.ObjectField(…) in OnGUI() of my EditorWindow. I want to know the event that mouse click on it and than to do something like make Scene Window to focus that object. Can someone please tell me how to register or listen this kind of event?

Have you tried Event.current.GetTypeForControl()?