Editable grid's model doesn't change on second textfield

[GoogleCodeExporter]

In the editable grid, such as user list panel, click the name to edit
and change someone's name, it works fine. But when you try to edit 
another name, it will throw exception, which can be found at the browser's 
console, because this._model doesn't have renderFunctions property, 
at line 99 of Ext20.GridPanel.js.

Original issue reported on code.google.com by simon...@gmail.com on 1 Dec 2009 at 2:00

[GoogleCodeExporter]

Sounds like the renderColumn method is being called in the wrong scope; debug 
the
call to renderColumn when editing the name and see what object is assigned to 
'this'.

Original comment by lloyd.colling@gmail.com on 2 Dec 2009 at 2:54