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I try to built a DataGrid, and I want to bind one of the TextColums' Foreground property to a Date, so that it becomes red, if the Date is in the past. Here the XAML: <toolkit:DataGridTextColumn Binding="{Binding Path=Prüfdatum, Converter={StaticResource TimestampToDateConverter}}" Header="Prüfdatum" Foreground="{Binding Path=Prüfdatum, Converter={StaticResource TimestampToColorConverter}, ConverterParameter=Prüfdatum}" /> Here my Converter: class TimestampToColorConverter: IValueConverter { #region IValueConverter Member public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { string Datum = value.ToString(); int year = System.Convert.ToInt32(Datum.Substring(6, 4)); int month = System.Convert.ToInt32(Datum.Substring(3, 2)); int day = System.Convert.ToInt32(Datum.Substring(0, 2)); int hour = System.Convert.ToInt32(Datum.Substring(11, 2)); int minute = System.Convert.ToInt32(Datum.Substring(14, 2)); int second = System.Convert.ToInt32(Datum.Substring(17, 2)); DateTime Time = new DateTime(year, month, day, hour, minute, second); if (Time < System.DateTime.Now) { return Brushes.Red as Brush; } else { return Brushes.Black as Brush; } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return null; } #endregion } I don't know what is wrong, but the Converter is not even caled (The first Converter works perfectly). The output window shows this: System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=Prüfdatum; DataItem=null; targ

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