CEdit's ballon notification (ES_NUMBER)

[J B 0]

Hi guys, I found using the CEdit control in Visual Studio .NET, if the control's ES_NUMBER is set (numbers only), a ballon type of notification is automatically implmented and will pop-up when the users try to type non-number character in the edit box. It works on my first app. However, this special effect no longer works in my second app when using the same standard CEdit control. Typing non-number character will make the error sound, but no longer prompts the ballon notification. What could have prevented from happening? Thanks