Having this setup:
<telerikDataGrid:DataGridTemplateColumn HeaderText="Age"
CanUserSort="True">
<telerikDataGrid:DataGridTemplateColumn.CellContentTemplate>
<DataTemplate>
<Label Text="{Binding Age}" />
</DataTemplate>
</telerikDataGrid:DataGridTemplateColumn.CellContentTemplate>
<telerikDataGrid:DataGridTemplateColumn.SortDescriptor>
<telerikCommon:PropertySortDescriptor PropertyName="Age" SortOrder="Descending" />
</telerikDataGrid:DataGridTemplateColumn.SortDescriptor>
</telerikDataGrid:DataGridTemplateColumn>
When applying SortDescriptor to the Template column, the column is not initially sorted.