Hi,
Can you try:
case K_mF1:
         return IUP_DEFAULT;
         break;

According with IUP online help:
If returns IUP_DEFAULT the key is processed but it is not propagated. 

If key is processed, maybe solve your case.

Best,

Ranier Vilela
________________________________________
De: Pete Lomax via Iup-users <[email protected]>
Enviado: sexta-feira, 1 de dezembro de 2017 00:20
Para: [email protected]
Cc: Pete Lomax
Assunto: [Iup-users] Silence Alt-keys

Does anyone know how to silence Alt keys? I have tried returning IUP_IGNORE 
from K_ANY, KEYPRESS_CB, GLOBALKEYPRESS_CB, and K_mC but it still sounds the 
bell, unless there is a matching accelerator key on a menu, mind you I also 
want to be able to process keys such as Alt + ',' (and I have tried K_mComma 
too).

Pete

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