code: function( element, itemConfig ) {
  		this.config.settings.constrainDragToContainer = false;
  		new lm.controls.DragSource( $( element ), itemConfig, this );
  	}
docs: Attaches DragListener to any given DOM element
  and turns it into a way of creating new ContentItems
  by 'dragging' the DOM element into the layout
  
  @param   {jQuery DOM element} element
  @param   {Object} itemConfig for the new item to be created
  
  @returns {void}