/// <summary>
/// Register a particular <c>ICommand</c> class as the handler
/// for a particular <c>INotification</c>.
/// </summary>
/// <remarks>
/// <para>
/// If a <c>ICommand</c> has already been registered to
/// handle <c>INotification</c>s with this name, it is no longer
/// used, the new <c>Func</c> is used instead.
/// </para>
/// <para>
/// The Observer for the new ICommand is only created if this the
/// first time an ICommand has been regisered for this Notification name.
/// </para>
/// </remarks>
/// <param name="notificationName">the name of the <c>INotification</c></param>
/// <param name="commandType">the <c>ICommand</c> type</param>
public virtual void RegisterCommand(string notificationName, Type commandType)
{
if (!CommandMap.ContainsKey(notificationName))
{
MyView.RegisterObserver(notificationName, new Observer(ExecuteCommand, this));
}
CommandMap[notificationName] = commandType;
}