code: public static void setDefaultCursor (Cursor.SystemCursor defaultCursor) {
  		if (defaultCursor == null) throw new IllegalArgumentException("defaultCursor can't be null");
  		CursorManager.defaultSystemCursor = defaultCursor;
  		CursorManager.systemCursorAsDefault = true;
  	}
docs: Sets cursor that will be used as default when {@link #restoreDefaultCursor()} is called, for example by Vis widget.
  @param defaultCursor default cursor from {@link Cursor.SystemCursor}, can't be null