public override async void ViewDidAppear(bool didAppear)
        {
            ActivityIndicator.Hidden = false;
            ActivityIndicator.StartAnimating();

            // Perform any additional setup after loading the view, typically from a nib.
            if (DataLayer.Instance.GetLocalBoxesSync().Count > 0)
            {
                var remoteExplorer = new RemoteExplorer();

                try {
                    List <Site> sites = await remoteExplorer.GetSites();

                    foreach (LocalBox box in DataLayer.Instance.GetLocalBoxesSync())
                    {
                        for (int i = 0; i < sites.Count; i++)
                        {
                            if (box.BaseUrl == sites [i].Url)
                            {
                                sites.RemoveAt(i);
                                break;
                            }
                        }
                    }

                    ActivityIndicator.StopAnimating();
                    ActivityIndicator.Hidden = true;

                    _tableSource     = new TableSource(sites);
                    TableView.Source = _tableSource;
                    TableView.ReloadData();

                    if (sites.Count == 0)
                    {
                        GeenSites.Hidden = false;

                        if (_introduction)
                        {
                            ToevoegenButton.SetTitle("Verder", UIControlState.Normal);
                        }
                    }
                } catch (Exception ex) {
                    Insights.Report(ex);
                    DialogHelper.ShowErrorDialog("Fout", "Er is een fout opgetreden tijdens het ophalen van de sites.");
                }
            }
        }
		public override async void ViewDidAppear(bool didAppear) 
		{
			ActivityIndicator.Hidden = false;
			ActivityIndicator.StartAnimating ();

			// Perform any additional setup after loading the view, typically from a nib.
			if (DataLayer.Instance.GetLocalBoxesSync ().Count > 0) {
				var remoteExplorer = new RemoteExplorer ();

				try {
					List<Site> sites = await remoteExplorer.GetSites ();

					foreach (LocalBox box in DataLayer.Instance.GetLocalBoxesSync()) {
						for (int i = 0; i < sites.Count; i++) {
							if (box.BaseUrl == sites [i].Url) {
								sites.RemoveAt (i);
								break;
							}
						}
					}

					ActivityIndicator.StopAnimating ();
					ActivityIndicator.Hidden = true;

					_tableSource = new TableSource (sites);
					TableView.Source = _tableSource;
					TableView.ReloadData ();

					if (sites.Count == 0) {
						GeenSites.Hidden = false;

						if (_introduction) {
							ToevoegenButton.SetTitle("Verder", UIControlState.Normal);
						}
					}
				} catch (Exception ex) {
					Insights.Report (ex);
					DialogHelper.ShowErrorDialog ("Fout", "Er is een fout opgetreden tijdens het ophalen van de sites.");
				}
			}
		}