Thank you for reporting this bug. I've logged it into our feedback portal
where you could vote and track it's current status.
Meanwhile I could offer you a workaround which you could find in the attached project. Basically you need to inherit the RadNumericUpDown and overriding the OnKeyDown
method in which you could determine which key should be handled or not. Please take a look into the sample project and if you have any questions or concerns regarding this issue don't hesitate to contact us again.
Once again we are sorry for the inconvenience caused. Your Telerik points were updated for your cooperation.
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