>>I have been battling to get a form to work, eventually the problem was found to be two business objects on different pages of a page frame were set up as the primary business object. It appears that there "Can be only one!" is this true?
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>Yes, I believe that there can only be one primary business object on a form. To work around this, I believe it is covered in the docs that you can make an biz object the primary one when a page is activated.
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>>The form now dies when I add an option button group, last time I tried this I traced the code in the debuger and it appeared to fall back to the read events statement. I think it had something to do with security even though the security option was disabled. Can anyone give me some tips on using option buttons on a form?

Actually, you can set a bizobj to become the primary bizobj when the page is activated, if that is what you need. Otherwise, bizobjs are usually children of parent objects.