Loading and Saving Quick Access Bar buttons

I am trying to save the Quick Access CommandBar to a string which then saves it to our database (user specific options). 

I have followed the example on the Ribbon MDI, but that uses either an XML file to save to. I decided to take the string from the PropExchange (px) Value property as the XML is in there and save it to the database and reload it.

How do I correctly re-apply this XML to the CommandBar like the px.LoadFromFile() method has done? I tried setting the px.Value property with this XML string, however it does not set the bars. If I replace the px.Value with the px.LoadFromFile with the same XML, it appears to work fine!!! If I load the file into a string with the FileSystemObject VB6 class, it still does not add my buttons!!!

px.LoadFromFile() appears to be doing something 'special' to set up the PropExchange so I can apply it to my ribbonbar. Does anyone know what this is, or should I be tackling this a different way?

Thanks!