private void OnStartButtonClicked(object sender, EventArgs e)
{
var startButton = sender as Button;
// Create menu to show navigation options
var navigationMenu = new PopupMenu(this, startButton);
navigationMenu.MenuItemClick += OnNavigationMenuItemClicked;
// Create menu options
foreach (var navigationType in _navigationTypes)
navigationMenu.Menu.Add(navigationType);
// Show menu in the view
navigationMenu.Show();
}