code: function(el) {
      el = el || this._elTbody;
      var oSelf = this;
      this._storeScrollPositions();
      // http://developer.mozilla.org/en/docs/index.php?title=Key-navigable_custom_DHTML_widgets
      // The timeout is necessary in both IE and Firefox 1.5, to prevent scripts from doing
      // strange unexpected things as the user clicks on buttons and other controls.
      
      // Bug 1921135: Wrap the whole thing in a setTimeout
      setTimeout(function() {
          setTimeout(function() {
              try {
                  el.focus();
                  oSelf._restoreScrollPositions();
              }
              catch(e) {
              }
          },0);
      }, 0);
  }
docs: Sets focus on the given element.
  
  @method _focusEl
  @param el {HTMLElement} Element.
  @private