Hello everyone!
I'm using RadMaskedNumericInput by Telerik and I have some problems with decreasing value by pressing key down. 

For example:
The "MaskedInputExtensions.Minimum" is set in "1" and when page is opened,  I can see number "1". After that I'm pressing key up many times and the number is increasing. No matter how much time I will press key up button, the number always increasing. And for example: I have increased the number to "12" and when I'm pressing key down to decrease this number, it stops on "10". The same problem with "100" and "1000" etc....

Someone can help me?

Hello Roman,

The described behavior is not expected and we have logged it as a bug in our Feedback Portal where you can track its progress and vote for it.
The issue is reproducible when you set the Mask property to NoMask (Mask=""), therefore I can suggest you as a workaround to use another MaskToken (e.g. #, Mask="#9") if this is suitable for your scenario.

Please excuse us for the inconvenience caused.

Regards,
Milena
Telerik