We needed to tap nested list items programmatically for testing purposes, so I came up with this little function:

PHP Code:
var selectNesetedListIndex = function (nestedListindex)                   
{                        
          var list = 
nestedList.getActiveItem();
          list.
select(index);

          var 
= {
                    
'target':list.getItems().items[0].innerItems[index].element
          
};

          
Ext.defer(function() {
                     list.
fireEvent('itemtap', list, index, list.getAt(index), nulle);                       
          }, 
100);
}; 
This works on 2.2.1 without errors. It's hacky and likely to break in future versions of ST, but as I said this is for testing only.