code: function(e, el) {
          var key = e.getKey();
  
          if(key === e.ENTER || (key === e.TAB && this.selectOnTab)) {
              this.selectItem(this.picker.getSelectionModel().getSelection()[0]);
          }
      }
docs: Handles a keypress event on the picker element
  @private
  @param {Ext.EventObject} e
  @param {HTMLElement} el