Beep when Enter is pressed?

I have just noticed that if my users press the TAB key to change to the next TextField in my .exe, it works fine.
BUT, if they press the ENTER key to change fields - the system beeps.

This is the code I have in the TextField’s KeyDown event:

if Key = chr(9) or Key = chr(13) then TextField2.SetFocus end if

Any ideas what is causing this, or how to prevent it?

Thank you all in advance.

return true to avoid the beep.
Beep is when no event handled the key.

Wow - that was quick!

Danke Sehr, Christian.

Be aware that chr(3) is the numeric keypad Enter key on many keyboards and chr(13) is the normal Return key.