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