/// <summary>
/// A custom eventhandler
/// It shows information about a bikestation</summary>
/// when the pin is tapped on the map
/// <param name="tappedPin"></param>
public async void OnPinClicked(Pin tappedPin)
{
var availablespots = serverClient.GetAvailability(tappedPin.Label.Substring(4, tappedPin.Label.Length - 4));
await Application.Current.MainPage.DisplayAlert("Location: " + tappedPin.Address, "Spaces: " + availablespots.Total + "\n" + "Occupied: " + availablespots.Occupied, "OK");
}