Scene View Axis of Movement

In a custom editor in the scene view I want to be able to execute some code when the UP axis of movement is NOT selected. Is there a way to determine which control is selected before digesting the event in my OnSceneGUI()?

 void OnSceneGUI() {
     if(/*UP AXIS*/) { 
         return; // use unity default action
     }
     if (Event.current.isMouse 
        && Event.current.button == 0 
         && Event.current.type == EventType.MouseDrag) {
         // do some stuff
         Event.current.Use();
     }
 }

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