public void resizeAtControlPoint(
      WorldWindow wwd,
      AirspaceControlPoint controlPoint,
      Point mousePoint,
      Point previousMousePoint) {
    // Include this test to ensure any derived implementation performs it.
    if (this.getAirspace() == null) {
      return;
    }

    if (this != controlPoint.getEditor() || this.getAirspace() != controlPoint.getAirspace()) {
      return;
    }

    this.doResizeAtControlPoint(wwd, controlPoint, mousePoint, previousMousePoint);
  }
  public void removeControlPoint(WorldWindow wwd, AirspaceControlPoint controlPoint) {
    // Include this test to ensure any derived implementation performs it.
    if (this.getAirspace() == null) {
      return;
    }

    if (wwd == null || controlPoint == null) {
      return;
    }

    if (this != controlPoint.getEditor() || this.getAirspace() != controlPoint.getAirspace()) {
      return;
    }

    this.doRemoveControlPoint(wwd, controlPoint);
  }