I'm in the process of porting a WPF app from VS 2010 to VS 2012.  At the same time, I'm porting from Infragistics 2011 Vol. 2 to 2012 Vol. 1.  My application uses the xamRibbon control, which has multiple ribbon tabs.  In the VS 2012 designer, I am not able to click on a ribbon tab to see the contents of that tab.  When I run the app, I can click on the tabs and see each tab's content without issue. It's just the VS 2012 designer that's giving me a headache.  If I open the same solution in VS 2010 (still using Infragistics 2012.1 ribbon control), I'm able to see the ribbon tab contents just fine when I click on a tab in the designer.  You can duplicate this problem by creating a simple starter WPF app with just a riboon control and 2 tabs.  Is this a bug or is there something about the VS 2012 designer that I don't understand?