finalDeviceSpecificCodeSolution

perfectDeviceSpecificCode.cs

var qualifiers = Windows.ApplicationModel.Resources.Core.ResourceContext.GetForCurrentView().QualifierValues;

            if (qualifiers.ContainsKey("DeviceFamily") && qualifiers["DeviceFamily"] == "Desktop")
            { 
             ApplicationViewTitleBar formattableTitleBar = appView.TitleBar;
             formattableTitleBar.ButtonBackgroundColor = Colors.Transparent;
             CoreApplicationViewTitleBar coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
             coreTitleBar.ExtendViewIntoTitleBar = true;
             appView.SetDesiredBoundsMode(ApplicationViewBoundsMode.UseCoreWindow);
             
              
            }