Add new row in table and focus in last row input element

dubzilla

Dear all,
can you help me to focus in in last row input element when dynamically add new row.

Here is my code for new row
[code]
var addId = myTable.fnAddData([
'',
'elemtn2',
'element3']);
var theNode = myTable.fnSettings().aoData[addId[0]].nTr;

theNode.find('.item_name').focus() //not working
[/code]