private void CleanupDeletedEntities()
        {
            if (QueuedForDisposal.Count > 0)
            {
                foreach (CharacterEntity entity in QueuedForDisposal)
                {
                    entity.DynamicBody.Enabled = false;
                    entity.DynamicBody.Dispose();
                    ActiveEntities.Remove(entity);

                    EnemyEntity enemy = entity as EnemyEntity;
                    if (enemy != null)
                    {
                        Enemies.Remove(enemy);
                    }
                    else
                    {
                        EggEntity egg = entity as EggEntity;
                        if (egg != null)
                        {
                            Eggs.Remove(egg);
                        }
                    }
                }
                QueuedForDisposal.Clear();
            }
        }