When I was using RadNumericTextBox, I got an error window when LMB is up over a spin button.
When I pressed LMB on increase/decrease buttons and held LMB without releasing it, everything was OK. The corresponding value could be changed correctly.
But when LMB was released, an error message box poped up. At that time, there is no postback yet. So I think the error raised from client.
I do not know which event raised when LMB is up over a spin button, so I am not able to trace the error.
Could you provide me some ideas about how to investigate some kind of issue?