code: function(e) {
          var me = this;
  
          // Set this flag, so that when AbstractComponent's onFocus gets the focusEl to add the focusCls
          // to, it will get the encapsulating element - that's what the CSS rules for Button need right now
          me.useElForFocus = true;
          me.callParent(arguments);
          me.useElForFocus = false;
      }
docs: Buttons add the focus class to the *outermost element*, not the focusEl!