>BUT "apply to method code" does not stay checked so after closing the form the "apply to method code" unchecks itself. Shouldn't that stay checked when I save changes or save the form? How can it be made to stay checked?

I do not know. But as far as I see, even it is not checked at the moment, the settings remains for the form you did it, and applyed to another forms too (even you did not do it for particular form).