/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached.
/// This parameter is typically used to configure the page.</param>
async protected override void OnNavigatedTo(NavigationEventArgs e)
{
//set which items are visible
BottomBar.Visibility = Visibility.Collapsed;
RecentReadsListView.Visibility = Visibility.Collapsed;
LibraryListView.Visibility = Visibility.Visible;
//set which buttons are currently chosen
RecentReadsBorder.BorderThickness = new Thickness(0);
LibraryBorder.BorderThickness = new Thickness(3);
_isRecentReads = false;
//open data
await RetrieveLibrary();
LibrarySource.SortByBookNameAscending();
LibraryListView.Focus(FocusState.Programmatic);
//make no item currently selected
LibraryListView.SelectedItem = null;
//set a MainPage for other pages to access this
Current = this;
}