GridViewComboBoxColumn with nullable value

[Josh Eastburn]

I am using v2012.3.1129.1050 of the Telerik Silverlight controls.
In my GridViewComboBoxColumn, my ItemsSource is a List<Assignment>:

public class Assignment
{
    public int? RecordId { get; set; }
    public string ReportLabel { get; set; }
}

I am populating the list from my RIA context, but then doing an Insert() to add an additional value with a NULL RecordId and a ReportLabel of "None Assigned".  Everything works fine with selecting and saving items from the list, but I select the NULL value, when I click away from the combobox column, the entire column goes blank instead of showing "None Assigned."

Is there a way to honor the NULL SelectedValue in the combobox column?

Thanks,
Josh

[Dimitrina]

Hi Josh,

There is not such a built-in option, but you could use a Converter for the Binding and change the value as per your requirements. Will this option work for you?

All the best,
Didie
the Telerik team

[Josh Eastburn]

Thanks, Didie.
Yes, I had considered using a converter with a -1 value but wanted to see if I was missing a way to use NULLs with the combobox.  I will go the converter route.
Thanks,
Josh