The 'idField' property indicates what field value will be retrieved and updated to the editing row. You can set it to 'name' that equals to the 'treeField' property.
Is There other way to achieve in your example
http://code.reloado.com/odiroq3/edit#javascript,html,live that will show 'textField' or 'treeField' property instead of 'idField' after combotreegrid editing in datagrid?
in case {idField: 'name'} don't work dynamicaly loading nodes in combotreegrid, because json became like this {id: 'name'}, what isn't convenient.