Problem with numeric text box validantion

[Igor]

Hello guys

I'm having a problem with the NumericTextBox. Here is a jsfiddle example http://jsfiddle.net/Ns6sd/16/

The validation fails on almost every occasion: 
- go one level up, and validate
- write your own number, ex. 2.3 and validate

The validation passes if you: 
- go one level down and press validate (now if you go up and validate it will work, but if you enter your own number it fails again)

Please help me solve this problem

Best Regards