Sorting a column without SortMemberPath

[Don]

I have a RadGridView populated by a collection of objects. The first column uses a converter for the DataMemberBinding like so:

<telerik:GridViewDataColumn
    Name="NotificationTypeGridViewDataColumn"
    Header="Type"
    MinWidth="100"
    Width="100"
    IsSortable="True"
    SortingState="None"
    DataMemberBinding="{Binding Converter={StaticResource notificationTypeConverter}}"
    >
</telerik:GridViewDataColumn>

The converter returns a string based on the typeof(object) in the collection.  Since there is no property on the object I can name for the SortMemberPath to sort from, how then can I sort this GridViewDataColumn based on the string returned by the converter?  Do I have to use the "Sorting" handler and custom sort all of the columns?  Thanks.

[Don]

Bah!  Nevermind.  I just implemented a sorting method for the column.