Lag when the system repaints the check boxes

[AlexZ]

Hi fellas.

I am using a dialog with check boxes that use a dll for some nice simulations. It works fine, but the system only repaints the check box once the dll is finished. So there is a little lag, since the user checks the box and the box is repainted by the system.

I have used WM_COMMAND and BN_CLICKED notification code, as usual.

I can fix that using:

if check box state changes -> global_variable=1

WM_TIMER
if global_variable
--- global_variable=0
--- use dll

I would like to use a more elegant method, so my question is:

Please, is there any kind of notification after the check box is repainted? How to use it? Any other ideas?

Thanks for any help. Regards.