Add-In: VS 2012 get list of multiple code window tabs selected

I have created an Add in and have it working.  I have added to the context menu when you right click on the code window tab and I can get the code file name using _applicationObject.ActiveDocument.FullName.

In VS 2012 you can CTRL-click to select multiple code window tabs.  In this case when right clicking on the tab I would like to get the code file name for each of those tabs.  Is there a way to do that?

Thanks