Add preserve attr to 1326,1400

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1326.cs

@@ -33,17 +33,18 @@ namespace Xamarin.Forms.Controls.Issues
 
 			Content.BindingContext = _model;
 		}
-
+		[Preserve(AllMembers = true)]
 		class MyItem
 		{
 			public String Description { get; set; }
 		}
-
+		[Preserve(AllMembers = true)]
 		class MyItemsViewModel
 		{
 			public List<MyItem> MyItems { get; set; } = new List<MyItem>();
 		}
 
+		[Preserve(AllMembers = true)]
 		class MyViewCell : ViewCell
 		{
 			Label label;

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1400.cs

@@ -88,8 +88,8 @@ namespace Xamarin.Forms.Controls.Issues
             List.ItemsSource = newlist;
         }
     }
-
+	[Preserve(AllMembers = true)]
-    public class MyData : INotifyPropertyChanged
+	public class MyData : INotifyPropertyChanged
     {
         public event PropertyChangedEventHandler PropertyChanged;
 
@@ -113,8 +113,8 @@ namespace Xamarin.Forms.Controls.Issues
             if (PropertyChanged != null) PropertyChanged(this, e);
         }
     }
-
+	[Preserve(AllMembers = true)]
-    public class MyGroup : ObservableCollection<MyData>, INotifyPropertyChanged
+	public class MyGroup : ObservableCollection<MyData>, INotifyPropertyChanged
     {
 	    string _headertitle;
 
@@ -131,7 +131,7 @@ namespace Xamarin.Forms.Controls.Issues
             }
         }
     }
-
+	[Preserve(AllMembers = true)]
 	internal class VCTest : ViewCell
     {
         public VCTest()
@@ -141,7 +141,7 @@ namespace Xamarin.Forms.Controls.Issues
             View = label;
         }
     }
-
+	[Preserve(AllMembers = true)]
 	internal class VCHeader : ViewCell
     {
         public VCHeader()