update sample

src/NotificationFlyout.Shared.UI/Class1.cs

@@ -1,29 +0,0 @@
-using System;
-using System.Drawing;
-
-namespace NotificationFlyout.Shared.UI
-{
-    public static class ImageSourceExtensions
-    {
-        public static Icon ConvertToIcon(this ImageSource imageSource, uint dpi)
-        {
-            if (imageSource == null) return null;
-
-            var uri = new Uri(imageSource.ToString(), UriKind.RelativeOrAbsolute);
-
-            var streamResource = Application.GetResourceStream(uri);
-            if (streamResource == null) throw new ArgumentException(nameof(streamResource));
-
-            return new Icon(streamResource.Stream, new System.Drawing.Size(PInvoke.GetSystemMetricsForDpi((int)SystemMetricFlag.SM_CXICON, dpi), PInvoke.GetSystemMetricsForDpi((int)SystemMetricFlag.SM_CYICON, dpi)));
-        }
-
-        private enum SystemMetricFlag : int
-        {
-            SM_CXICON = 11,
-            SM_CYICON = 12,
-            SM_CXSMICON = 49,
-            SM_CYSMICON = 50
-        }
-    }
-
-}

src/NotificationFlyout.Shared.UI/NotificationFlyout.Shared.UI.csproj

@@ -1,7 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
-  </PropertyGroup>
-
-</Project>

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyout/NotificationFlyout.cs

@@ -1,9 +1,11 @@
 using System;
 using Windows.UI.Xaml;
+using Windows.UI.Xaml.Markup;
 using Windows.UI.Xaml.Media;
 
 namespace NotificationFlyout.Uwp.UI.Controls
 {
+    [ContentProperty(Name = "Content")]
     public class NotificationFlyout : DependencyObject
     {
         public static readonly DependencyProperty IconSourceProperty =