WPF 4 DataGrid: Getting the Row Number into the RowHeader

Question

I am looking to get the row number into the RowHeader of the WPF 4 DataGrid so it has an Excel-like column for the row numbers of the DataGrid.

The solution I\'ve se

Answer 1

Edit: Apparently scrolling changes the index so the binding won't work like that...

A (seemingly) clean templating solution:
Xaml:

Converter:

public class RowToIndexConv : IValueConverter
{

    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        DataGridRow row = value as DataGridRow;
        return row.GetIndex() + 1;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}