ext js 4 rowediting如何在网格中为selenium测试id目的添加自定义属性

I have an ext js grid that uses the plugin row editing. I need to write selenium test scripts and would like to assign static ids or custom attributes to the row editing form fields and update and cancel buttons.. I know how to rename button text.. but what I really need to do is add a attribute so I can reference with selenium testing. I have an ext js grid that uses the plugin row