nl_tokens: Override the Backbone _ensureElement () method in order to create a <g > node that wraps all the nodes of the Cell view .
pl_tokens: function ( ) { var el ; if ( ! this . el ) { var attrs = _ . extend ( { id : this . id } , _ . result ( this , 'attributes' ) ) ; if ( this . className ) attrs [ 'class' ] = _ . result ( this , 'className' ) ; el = V ( _ . result ( this , 'tagName' ) , attrs ) . node ; } else { <mask> = _ . result ( this , 'el' ) } this . setElement ( el , false ) ; }