private void OnVectorLayersClicked(object sender, EventArgs e)
{
var button = sender as Button;
// Create menu to show options
var menu = new PopupMenu(this, button);
menu.MenuItemClick += OnVectorLayersMenuItemClicked;
// Create menu options
foreach (var vectorLayerName in _vectorLayerNames)
menu.Menu.Add(vectorLayerName);
// Show menu in the view
menu.Show();
}