>Hi,
>
>I didn't 'show' the form. Now it works fine. Thanks :-)
>
>However, now appears another problem. The masterform can't be closed anymore. That form is modal and shows no effect to 'thisform.release' anymore.
>It seems, that the 'clear events' in the subclassed form is not enough?
>
>Best Regards, Tom

Leave out the Read Events. In the subclassed form, use the command ThisForm.Hide() instead of ThisForm.Release(). When the subclassed form is hidden, control is returned to the calling method [assuming the subclassed form is modal].