code: function(e, ddTargets) { 
        // The layer is the only target :
        var layerTarget = ddTargets[0],
  			 layer = ddTargets[0]._layer,
  			 del = this.getDragEl(),
  			 pos = Dom.getXY(del),
  			 layerPos = Dom.getXY(layer.el);
        this._WiringEditor.addModule( this._module ,[pos[0]-layerPos[0]+layer.el.scrollLeft, pos[1]-layerPos[1]+layer.el.scrollTop]);
      }
docs: Add the module to the WiringEditor on drop on layer
  @method onDragDrop