Split bars in contained forms.

So, the documentation states that the layout of split bars in contained forms is not preserved between instances in the same way it is in 'normal' forms. 
What if I really want it to be preserved? 
In the demo a while back of making the office "menu bar"  there was use of an undocumented feature to hide split bars, is there an undocumented feature to allow me to examine/store/set the position of the split bar within Proc? 
Regards,
Iain

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Iain Sharp
Head of Technical Services
Pci Systems Ltd
Sheffield GB
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