Apr 18, 2017 05:55 AM|Deepak Panchal|LINK
your description is too short and it did not provide any code sample to reproduce the issue.
you did not mentioned that on which version it was working and what is your latest version.
you can refer link below to get some example regarding RadNunmericTextBox.
RadNumericTextBox - Telerik ASP.NET NumericTextBox
For properties and methods of RadNunmericTextBox refer link below.
RadNumericTextBox Client Object
you can check your code and try to find the issue.
your issue is mainly related with Telerik Forum and not related with ASP.NET forum.
so you can try to post this issue on Telerik forum to get more better response and solution.
if there is any bug in new update then their support team can inform you and provide you a solution for your issue.