code: function(e) {
          var me = this,
              overTab = me._overTab,
              tabInfo, tab;
  
          if (e.getTarget('.' + Ext.baseCSSPrefix + 'box-scroller')) {
              return;
          }
  
          tabInfo = me.getTabInfoFromPoint(e.getXY());
          tab = tabInfo.tab;
  
          if (tab !== overTab) {
              if (overTab && overTab.rendered) {
                  overTab.onMouseLeave(e);
                  me._overTab = null;
              }
              if (tab) {
                  tab.onMouseEnter(e);
                  me._overTab = tab;
                  if (!tab.disabled) {
                      me.el.setStyle('cursor', 'pointer');
                  }
              } else {
                  me.el.setStyle('cursor', 'default');
              }
          }
      }
docs: private