Is it not possible to bind the ErrorTooltipContent property? I never get a value through and it defaults to "Error". What is the prefered way to localize this if it is a custom string.
There should be not problem to bind ErrorToolipContent property of RadDateTimePicker. Regarding localization - I would suggest to use LocalizationManager and create a separate .resx file for each one of the languages your application will support. The approach is described in details here. I've also prepared a simple example, please download the attachment and examine it.
Hope this helps.
Best wishes,
Yana
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