Set Cell to Edit mode from code

[centuit]

Hi,

I read most of your threads and I did not find way to do the following:

I have a requirement to set a single cell in the selected row from code behind using the SelectedItem property content which is a custom object. I am using your latest version and running Silverlight 5, can you please help.

Tried using _dataGrid.ItemContainerGenerator.ContainerFromItem(this._dataGrid.SelectedItem);
but it always returns null, I event even tried using ContainerFromIndex and putting a hard coded number, but it always returns null.

Thanks