code: function () {
  
              var pos = Dom.getXY(this.element);
  
              this.cfg.setProperty("x", pos[0], true);
              this.cfg.setProperty("y", pos[1], true);
              this.cfg.setProperty("xy", pos, true);
  
          }
docs: Synchronizes the Panel's "xy", "x", and "y" properties with the
  Panel's position in the DOM. This is primarily used to update
  position information during drag & drop.
  @method syncPosition