I've set the minimum value of my RadNumericUpDown to double.MinValue. I am able to hit the "-" sign on the numeric keypad, but not on the keyboard itself (between the 0 and = buttons above the P key). the RadNumericUpdown is filtering out this key. This is apperant when using a laptop, as they don't have a numeric keypad, so the user has to hit the fn key in order to get the "-" sign.
I had a similar issue with the "." key not working, I'm assuming this is more of the same. Here is a link to that thread
I really need an answer asap, and appreciate your help.