Binding DataGridTextColumn Forground with converter will not pick up correct color about mytoolkit HOT 6 CLOSED

public class BoolToColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        if (value != null && value is bool && (bool) value)
            return new SolidColorBrush(Colors.Red);

        return new SolidColorBrush(Colors.Black);
    }

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

Error: Converter failed to convert value of type 'Windows.UI.Color' to type 'Brush'; BindingExpression: Path='IsPrio' DataItem='TestMyToolkitGrid.Models.Location'; target element is 'Windows.UI.Xaml.Controls.TextBlock' (Name='null'); target property is 'Foreground' (type 'Brush'). 
Error: Converter failed to convert value of type 'Windows.UI.Color' to type 'Brush'; BindingExpression: Path='IsPrio' DataItem='TestMyToolkitGrid.Models.Location'; target element is 'Windows.UI.Xaml.Controls.TextBlock' (Name='null'); target property is 'Foreground' (type 'Brush'). 
Error: Converter failed to convert value of type 'Windows.UI.Color' to type 'Brush'; BindingExpression: Path='IsPrio' DataItem='TestMyToolkitGrid.Models.Location'; target element is 'Windows.UI.Xaml.Controls.TextBlock' (Name='null'); target property is 'Foreground' (type 'Brush').