Handle Selection

        // Get the needed data before the handle
        int controlIDBeforeHandle = GUIUtility.GetControlID(someHashCode, FocusType.Passive);
        bool isEventUsedBeforeHandle = (Event.current.type == EventType.Used);

        // Draw the handle at the position of each node in the waypoint array


        // Get the needed data after the handle
        int controlIDAfterHandle = GUIUtility.GetControlID(someHashCode, FocusType.Passive);
        bool isEventUsedByHandle = !isEventUsedBeforeHandle && (Event.current.type == EventType.Used);

        if
         ((controlIDBeforeHandle < GUIUtility.hotControl &&
           GUIUtility.hotControl < controlIDAfterHandle) ||
           isEventUsedByHandle)
        {
            selectedNodeIndex = n; // This gives me the index of the node that is selected
        }