DataGrid RowDetails Width problem

Question

Suppose I have a DataGrid that is defined like this

<DataGrid AreRowDetailsFrozen="True"
          ItemsSource="{Binding MyCollection}"
          AutoGenerateColumns="False">
    <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <Border CornerRadius="5" BorderBrush="Red"
                    BorderThickness="2" Background="Black">
                <TextBlock Foreground="White" Text="{Binding RowDetails}"
                           TextWrapping="Wrap"/>
            </Border>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>
    <DataGrid.Columns>
        <DataGridTextColumn Header="0" Binding="{Binding Value1}"/>
        <DataGridTextColumn Header="1" Binding="{Binding Value2}"/>
        <DataGridTextColumn Header="2" Binding="{Binding Value3}"/>
        <DataGridTextColumn Header="3" Binding="{Binding Value4}"/>
    </DataGrid.Columns>
</DataGrid>

And looks like this with and without RowDetails

In the picture to the right I get a very long DataGridRow that never wraps.
Is it possible to get the RowDetails to use the same width as the DataGrid and not effect the Width itself?

Things I have tried that achieves wrapping but not in a satisfying way

• Set Width or MaxWidth on the Border or the TextBlock. Not very dynamic.
• Set ScrollViewer.HorizontalScrollBarVisibility="Disabled" on the DataGrid. Not very good when the columns doesn't fit.

Answer 1

The answers here felt like a workaround so I did some research and did find the solution on the Telerik forums, since we use their RadGridView. Turned out the solution worked for DataGrid as well.

The key is to set the ScrollViewer.HorizontalScrollBarVisibility property to Disabled, see example below.

<DataGrid ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<DataGrid.RowDetailsTemplate>
    <DataTemplate>
        <Border>
            <TextBlock Foreground="White" Text="{Binding RowDetails}"
                       TextWrapping="Wrap"/>
        </Border>
    </DataTemplate>
</DataGrid.RowDetailsTemplate>

Edit: A side effect is that if the columns needs more space horizontally than there are room for they will be clipped. So if this is a problem then this solution isn't optimal.