[AccessD] Saving subform format

I don't open anything as a popup with my code. Which method are you
referring to?

The one where I just use
       DoCmd.RunCommand acCmdSave right before changing the subform
sourceobject? Unless you mind saving the main form, that is the simplest
method.

If you are getting the pop up problem using the other method where I open
the standalone for in design view then I do not know why,  I would have to
see your code.