Interface Entity
{
??
}

Interface IComponent
{
    public void SetBehaviour(IBehaviour);
    public void Update();
}
Interface IPositionComponent : IComponent
{
    ???
}

class PositionCompnent : IPositionComponent
{
    public void Update()
    {

    }
}

Interface IDrawComponent : PositionComponent
{

}

interface IBehaviour
{
    //Properties...
}

class BunnyPositionBehaviour : IBehaviour
{
    //....
}

class BunnyDrawBehaviour : IBehaviour
{
    //....
}

class Bunny : ?
{

}

void main()
{
    Bunny bigBunny = new Bunny();
    bigBunny.AddComponent( new DrawComponent());
    bigBunny.GetComponent("DrawComponent").SetBehaviour(BunnyDrawBehaviour);
    bigBUnny.GetComponent("PositionComponent").SetBehaviour(BunnyPositionBehaviour);
}