code: function(dataview) {
          /**
           * @property dataview
           * @type Ext.view.View
           * The DataView bound to this instance
           */
          this.dataview = dataview;
          dataview.mon(dataview, {
              beforecontainerclick: this.cancelClick,
              scope: this,
              render: {
                  fn: this.onRender,
                  scope: this,
                  single: true
              }
          });
      }
docs: Initializes the plugin by setting up the drag tracker