title: Xamarin forms Combobox:SFComboBox!! How i can refresh my combobox?
body: <p>I'm trying to use CollectionChanged.</p>
  <p>My code:</p>
  <pre><code>public List&lt;RSSNotification&gt; Notificacoes { get; private set; }
  public RSSReader rssreader;
  public List&lt;RSSReader&gt; feedsAdicionados = new List&lt;RSSReader&gt;();
  ObservableCollection&lt;string&gt; comboFeeds = new ObservableCollection&lt;string&gt;();
  
  public ThirdPage(List&lt;RSSReader&gt; feed, List&lt;RSSNotification&gt; Not)
  {
              InitializeComponent();
              mycombobox.ItemsSource = ComboFeeds;
              ComboFeeds.Clear();
              Notificacoes = Not;
              feedsAdicionados = feed;
              
              for (int i = 0; i &lt; feedsAdicionados.Count; i++)
              {
                  if (feedsAdicionados[i] != null) ComboFeeds.Add(feedsAdicionados[i].title);
              }
          }
  
  </code></pre>
  <pre><code>private async void ButtonAdicionar_Clicked(object sender, EventArgs e)
          {
              rssreader = new RSSReader();
              PopUp1 Pop = new PopUp1(0, rssreader, feedsAdicionados, Notificacoes);
  
              await Navigation.ShowPopupAsync(Pop);
  
              await DisplayAlert(&quot;Sucesso&quot;, &quot;Feed Adicionado com sucesso&quot;,  &quot;Ok&quot; );
  
              Notificacoes = Pop.Notificacoes;
              rssreader = Pop.RSS;
              ComboFeeds.Add(rssreader.title);
  
              this.ComboFeeds.CollectionChanged += ComboFeeds_CollectionChanged;
          }
  private void ComboFeeds_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
          {
              
          }
  </code></pre>
  <p>When the popup ends, I add it to my combobox via a class, then try to update, but it doesn't work.</p>
  <p>Thx for all help</p>