All it shows is an empty rectangle for which one cannot change style or template.
In VS 2010 RC designer, however, it displays correctly.
What can be done to make Expression Blend work with NumericUpDown?
I can't reproduce the issue you have mentioned , I have attached a screenshot how it appears at my side.
Could you please specify which version of Telerik controls are you using and also Which version of Blend are you using, is it 3 or 4.
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