code: function() {
          if(DT._elColumnDragTarget) {
              var el = DT._elColumnDragTarget;
              YAHOO.util.Event.purgeElement(el);
              el.parentNode.removeChild(el);
              DT._elColumnDragTarget = null;
              
          }
      }
docs: Destroys shared Column drag target.
  
  @method DataTable._destroyColumnDragTargetEl
  @private
  @static