Strange Behavior - PageFrame

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With VFP 9, I have a form with a PageFrame. Supposed to be a
reusable form, ie, user can press a button to Add an Invoice then do
all the functions associated with Adding An Invoice, then they can
press a button to Change an Invoice, all without exiting and
reentering the form. I reset all the form text and combo fields, but
the problem is when I try to do a second function, ie Add An Invoice,
on the PageFrame the 1st two ComboBoxes work fine, but every field
after that is disabled when I click on the field or comboBox. At No
Point in this program do I ever disable/invisible these fields and
want to know what functions/commands would produce this behavior?

These fields do have the ControlSource reset, but the 1st two Comboxes
go thru the same 'Reset' routine.

Hope this makes some kinda sense... And thanks for your help.
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