You should hear a beep when typing invalid characters in to the edit control unless your sound is off. I've never seen a text entry show invalid characters while your typing. I don't think it's a good idea to change the behavior to show red invalid characters while typing so this is unlikely to get fixed.
You should hear a beep when typing invalid characters in to the edit control unless your sound is off. I've never seen a text entry show invalid characters while your typing. I don't think it's a good idea to change the behavior to show red invalid characters while typing so this is unlikely to get fixed.