Cannot sort Silverlight DataGrid time column

I have run into one problem while working on Silverlight DataGrid sorting functionnality. There was a problem of sorting DateTime column.

In order to enable sorting for ordinary columns in Silverlight DataGrid control all you have to do is simply add

CanUserSort="True

to the definition of the column

<sdk:DataGridTemplateColumn x:Name="timeColumn" Header="Time" Width="Auto" CanUserSort="True" >


This works perfectly for ordinary fields(like integers). But for the DateTime type it does not work. And solution for this is to add jet another parameter
SortMemberPath="Time" >
And now this works!


 
<sdk:DataGridTemplateColumn x:Name="timeColumn" Header="Time" Width="Auto" CanUserSort="True" SortMemberPath="Time" >
                    <sdk:DataGridTemplateColumn.CellEditingTemplate>
                        <DataTemplate>
                            <sdk:DatePicker SelectedDate="{Binding Path=Time, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}" />
                        DataTemplate>
                    sdk:DataGridTemplateColumn.CellEditingTemplate>
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Path=Time, StringFormat=\{0:d\}}" />
                        DataTemplate>
                    sdk:DataGridTemplateColumn.CellTemplate>
                sdk:DataGridTemplateColumn>
































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