Access Access 2007 Disable Close and Close All on Tabbed Documents

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Hi, I have my database set up with tabbed documents and I want to keep that as I like to be able to move between the forms easily. However, I want to prevent users from using the right click Close or Close All on the tabs as I want them to use a button I've put on the forms that has code behind it (I've disabled the right hand corner x to close) but my users are still managing to close forms without using my command button and this is the only other solution I can think of. I don't want to remove the tabs altogether as I like them for navigation, and I don't want to have overlapping windows as the forms are built to make full use of the screen. I suppose I could put a custom ribbon up and use that for navigation but I don't know how to do that! Thank you so much in advance.