### Scenario

- Add MasterDetailPage to folder in Portable project.
- 4 files generated( HostPage.xaml, HostPageDetail.xaml, HostPageMaster.xaml, HostPageMenuItems.xaml)
### Issues

- HostPage.xaml: Incorrect XML namespace by including the folder name as part of the assembly path: xmlns:pages="clr-namespace:MyApp.Pages; assembly=MyApp.Pages"

- The generated class def in *.xaml is x:Class="MyApp.Pages.HostPage", but it mismatched with the code-behind *.xaml.cs, which the namespace is defaulted to "MyApp.Pages.HostPage"

- HostPageMaster.xaml.cs: a ViewModel is included but with a mismatched variable (MenuItems vs HostPageMenuItems)

class HostPageMasterViewModel : INotifyPropertyChanged
{
    public ObservableCollection<HostPageMenuItem> MenuItems { get; }
    public HostPageMasterViewModel()
    {
        HostPageMenuItems = new ObservableCollection<HostPageMenuItem>(new[]


Cross posted in https://forums.xamarin.com/discussion/90256/wrong-project-problematic-pages-template-issue-in-vs2017

### Steps

- Create X-Plat App > BlankApp + Forms + PCL
- Add new folders (Pages) to portable 
- Add 'Forms MasterDetailPage XAML' to the 'Pages' folder

### Version

VS 2017 Enterprise 15.0.0-RTW+26228.4
Xamarin 4.3.0.784