Implicit styles are set via refering included XAML files. Set Style targetting RadColorPicker and BasedOn RadColorPickerStyle. Set this stye in App.xaml after the resource dictionaries. In desinger - MS exception is thrown "This feature requires Microsoft.Windows.Design.Sevices.valueTranslationService".

Note that this is only reproducible when xaml fiels are included in the project. This is NOT reproducible when you reference xaml files from the style dll (for example Telerik.Windows.Themes.Office_Black).

The fix will be available in our official release Q2 2015 SP.