Hello Alain,
The issue is caused because the ResourceDictionaries are merged on UserControl level and they should be merged in the App.xaml - on application level. This is so because the Theme contains dynamic resources which should be loaded at start up of the Application and this is causing the missing resource exception. So you just need to move the MergedDictionaries into App.xaml and the text will appear.
Hope this helps.
Regards,
Kalin
Telerik
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