Hi,
We have scheduled the full localization of RadDateTimePicker, RadCalendar and RadClock for this Q so we will take care of the localization problems you mention. Meanwhile you could change the control template to fit your language or even use the telerik LocalizationManager to localize the Close button. You could find the full RadDateTimePicker, RadCalendar and RadClock styles in the installation folder of RadControls for Silverlight. For example on my computer they are located here:
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q2 2011\Themes\OfficeBlack\Themes\Office\Black\DateTimePicker.xaml
Kind regards,
Pana
the Telerik team
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