code: function (dx, dy) {
          var self = this, rect = self.layoutRect();
  
          self.moveTo(rect.x + dx, rect.y + dy);
  
          return self;
        }
docs: Move by a relative x, y values.
  
  @method moveBy
  @param {Number} dx Relative x position.
  @param {Number} dy Relative y position.
  @return {tinymce.ui.Control} Current control instance.