This works:

This has a problem using the spin buttons (they stop running after one click in each direction):
Note the only difference is the MaxLength=3 at the end.  If the Increment Step is 1, then it also works.  It has something to do with the last digit and maxlength, I think.

This is in 2009.3 (Jan release).  Not sure if it's in 2010.1, since that just arrived.

Hello Andy,

You should not use the MaxLength property with RadNumericTextBox. If you want to limit the value of the control you can use the MaxValue property.

Kind regards,
Pavel
the Telerik team

Since RadNumericTextBox inherits from RadTextBox and RadTextBox supports MaxLength, it seems odd that RadNumericTextBox wouldn't support it.  My reason for using it is to prevent users from entering a number with too many decimal digits (I know it will round, but I don't want to have to explain that to them).  And it only seems to have a problem with this specific circumstance, where the MaxLength is set, the Step is adjusting the last digit and increment/decrement features are attempted.  Doesn't look like a "don't do this", since it obviously works up to a point; it looks like a test case no one tested.

Hi Andy,

I understand your point however the MaxLength property is not intended for use with the RadNumericTextBox. It is unintuitive to limit the digits of a numeric value with a property that counts decimal digits/group separators. You can control the length of the decimal part of the entered value with the DecimalDigits property.

Best wishes,
Pavel
the Telerik team