/// <summary>
 /// Populates the page with content passed during navigation. Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     var happening = await new HssTicketing.DataSource.HappeningDataSource().GetHappeningAsync((int)e.NavigationParameter);
     this.DefaultViewModel["Happening"] = happening;
     this.DefaultViewModel["Tickets"] =  happening.Tickets;
     this.happening = happening;
 }
 /// <summary>
 /// Populates the page with content passed during navigation. Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     try
     {
         var happenings = await new HssTicketing.DataSource.HappeningDataSource().GetHappeningsAsync();
         DefaultViewModel["Happenings"] = happenings;
     }
     catch (Exception)
     {
         ExceptionMessages.DatabaseExceptionMessageAsync();
         this.Frame.Navigate(typeof(LogOnPage));
     }
 }
 /// <summary>
 /// Populates the page with content passed during navigation. Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     try
     {
         var happening = await new HssTicketing.DataSource.HappeningDataSource().GetHappeningAsync((int)e.NavigationParameter);
         pageTitle.Text = happening.HappeningName;
         pageHappening = happening;
     }
     catch (Exception)
     {
         ExceptionMessages.DatabaseExceptionMessageAsync();
         this.Frame.Navigate(typeof(LogOnPage));
     }
 }
 /// <summary>
 /// Populates the page with content passed during navigation. Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     try
     {
         var users = await new HssTicketing.DataSource.UserDataSource().GetUsersAsync();
         users.Add(new AddButton(true));
         DefaultViewModel["Users"] = users;
     }
     catch (Exception)
     {
         ExceptionMessages.DatabaseExceptionMessageAsync();
         this.Frame.Navigate(typeof(LogOnPage));
     }
 }
 /// <summary>
 /// Populates the page with content passed during navigation. Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
 }