In the end I achieved what I wanted by using scripting in the form:ready
event of specific objects.The radio button list (R1) has a form:ready
event in which I called the change event.In turn the R1 change event
calls the D1 change event.When I tracked these events through the form
loading process then I got the desired sequence R1, D1, R2, D2, etc
etc.Because the default value of R1 is to show the A1 subform, then when
a brand new form is loaded, and the R1 change event is called from the
form:...