WP7 TimeSpanPicker localization (Coding4Fun toolkit)

I'm using the TimeSpanPicker control from Coding4Fun in my app which is supposed to be translated already ([http://coding4fun.codeplex.com/discussions/256020]). I declared the SupportedCultures tag in my csproj file, but the texts in the timespanpicker ar开发者_StackOverflow中文版e still not translated (all other texts are). Do I need to declare something else in my project?

In case you are using short ISO language code try a longer version. For example cs-CZ instead of cs.