WinRT tablet/desktop doesn't always show TabbedPage TopAppBar on right click/swipe down

I have a an app with a MasterDetailPage and a TabbedPage is set as Detail. On WinRT, the TopAppBar with the TabbedPage icons doesn't always show if I right click or swipe down from the top. I have to switch Detail pages first before it would work. Are you guys experiencing the same thing?
By the way I'm using Xamarin.Forms 1.4.4.6392 and Windows 8.1. Xamarin.Forms 1.5 is crashing for windows 8.1 so I don't know if it's fixed there.