Questions from a customUI newbie

[Aflatoon]

You cannot alter the Mac ribbon, nor can you use conditionals in the XML - you have to use callbacks.
I'm not sure about the contextual tabs and startFromScratch.

Edit: have a read of this page: http://msdn.microsoft.com/en-us/libr...ContextualTabs

For general Ribbon information, it is worth reading Ron de Bruin's Ribbon/QAT pages here: http://www.rondebruin.nl/win/section2.htm