Hello,

Thank you for your feedback. I am glad that you resolved your issue and I believe that other community members may benefit from this as well.

Thanks again.

Thank you very much.

The convertor works.

But in the convertor the code    [ value.ToString() == "Sa"  ],    if the culture is not en-us there will be a problem. 

I change the code

Foreground="{Binding RelativeSource={RelativeSource Self},path=Text，Converter={StaticResource con}}" 

into

Foreground="{Binding RelativeSource={RelativeSource Self},Converter={StaticResource con}}" 

and

change the convertor as following

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

        {

                   var ele = value as TextBlock;

                   if (ele != null)

                   {

                           if (ele.DataContext.ToString() == "Saturday")

                           {

                                    return Brushes.Blue;

                           }

                           if (ele.DataContext.ToString() == "Sunday")

                           {

                                    return Brushes.Red;

                           }

                  }

                  return Binding.DoNothing;

        }

That‘s works in all culture  ^_^

Thank you very much. your sample code save me a lot of time