Simple Composition Design

Design.cs

interface IObject
{
    string Name { get; }
    IObject Parent { get; }

    void Add(string name, IComponent component);
    void Add(IObject child);
    void Remove(IObject child);
    IComponent GetComponent(string name);
    IEnumerable<IObject> GetChildren();
    void SendMessage(string message, params object[] parameters);
}

interface IComponent
{
    IObject Object { get; }
}

SendMessage.cs

// A naieve implementation of SendMessage
public void SendMessage(string message, params object[] parameters)
{
    var types = parameters.Select(a => a == null ? typeof(object) : a.GetType()).ToArray();
    foreach (var component in this.components.Values)
    {
        var method = component.GetType().GetMethod(message, types);
        if (method != null)
        {
            // Call methods on the component via reflection
            method.Invoke(component, parameters);
        }
    }
}