ExtJS网格 - 如何关注添加的行？

I have a grid(gridpanel) and data in it which I read from json query. After I added new bussines object(row) - I send him in json format to server, write to DB, and reload all grid. How I can focus on currently added row(b/o) after that? I will be very cool if I return added id at the json answer and grid take it and focus on row with added id. Thx.I have a grid(gridpanel) and data in it which I