R – Does each row in a silverlight dataGrid have to have the same “RowDetailsTemplate”

I'm defining a datagrid's RowDetailsTemplate in the following way:

RowDetailsTemplate="{StaticResource defaultTemplate}"

where

<UserControl.Resources>
    <DataTemplate x:Key="defaultTemplate">
        <StackPanel>
            <TextBlock Text="default" x:Name="_txt" />
        </StackPanel>
    </DataTemplate>
    <DataTemplate x:Key="otherTemplate">
        <StackPanel>
            <TextBlock Text="other" x:Name="_txt" />
        </StackPanel>
    </DataTemplate>
</UserControl.Resources>

Is there a way to programatically define which of the two above DataTemplates a given row is to use (perhaps in the LoadingRowDetails() event)?