private async void LoadUrl( object sender, RoutedEventArgs e )
{
StringResources stx = new StringResources( "AdvDM" );
DownloadBookContext UrlC = new DownloadBookContext();
Dialogs.Rename UrlBox = new Dialogs.Rename( UrlC, stx.Text( "Download_Location" ) );
UrlBox.Placeholder = "http://example.com/NN. XXXX.txt";
await Popups.ShowDialog( UrlBox );
if ( UrlBox.Canceled ) return;
FileListContext.LoadUrl( UrlC );
}