public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
Color?c = (Color?)value as Color?;
System.Windows.Media.BrushConverter converter = new System.Windows.Media.BrushConverter();
object x = null;
if (converter.CanConvertFrom(typeof(Color?)))
{
x = converter.ConvertFrom(c);
}
return(x);
}