//------------------------------- Messenger Events ---------------------------------------
public static void MessengerOnContractCreated(object source, EventArgs e)
{
Messenger messenger = Messenger.Instance;
var contract = (Contract)source;
string owner = contract.Owner.UserName;
messenger.AddToMessenger(DateTime.Now, "<b>" + owner + "</b>" + " hat neuen Vertrag erstellt");
System.Diagnostics.Debug.WriteLine("Benachrichtigung sollte erscheinen");
}