Make Subform Invisible using Form

I have many subforms on a form and I am using clicks on my main form to set
the visible property for each subform individually. I can click on one
button on my form and the subform shows up fine. Click on another button and
I make one subform invisible and another one visible. I have no need for a
link between the form and subform. This seems to work fine. However, when I
make one subform visible and click on the subform and thus change the focus I
am then unable to use the button on the form to make the subform invisible
again. It is as if the focus changes to the subform and I don't know how to
make it where I can make the subform invisible again. I have looked at
previous postings but cannot find this specific problem anywhere. Thank you
for your help.