Hey,
I have tried the extension datagrid-cellediting.js which is awesome!
But for some weird reason, the onCellEdit event returns undefined in the value.
Here is an example:
http://jsfiddle.net/3L4ej4dx/50/Press on any of the cells in the datagrid and an alert will pop up with the arguments from onCellEdit event,
you will then see that the value is always undefined.
Thanks!