DownloadAgent fixes and improvements

FoxTube/Pages/Downloads.xaml.cs

@@ -18,6 +18,7 @@ using Windows.UI.Xaml.Media;
 using Windows.UI.Xaml.Navigation;
 
 // The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+#pragma warning disable CS0252 // Possible unintended reference comparison; left hand side needs cast
 
 namespace FoxTube.Pages
 {
@@ -27,15 +28,26 @@ namespace FoxTube.Pages
     public sealed partial class Downloads : Page
     {
         ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
+        DownloadAgent agent = Methods.MainPage.Agent;
         public Downloads()
         {
             this.InitializeComponent();
             path.Text = settings.Values["defaultDownload"] as string;
 
-            foreach (DownloadItem item in Methods.MainPage.Agent.Items)
+            agent.ListChanged += UpdateList;
+
+            foreach (DownloadItem item in agent.Items)
                 stack.Children.Add(item);
         }
 
+        private void UpdateList(object sender, ObjectEventArgs e)
+        {
+            if (e.Parameters[0] == "remove")
+                stack.Children.Remove(sender as DownloadItem);
+            else if (e.Parameters[0] == "add")
+                stack.Children.Add(sender as DownloadItem);
+        }
+
         private async void changePath_Click(object sender, RoutedEventArgs e)
         {
             FolderPicker picker = new FolderPicker()