/// <summary>
/// Un-register an item from the instance
/// </summary>
/// <param name="item">The item to be un-registered</param>
public void UnregisterItem(Renderable item)
{
item.Delete(); // Call the delete method of the item
}
/// <summary>
/// Register an item to the instance
/// </summary>
/// <param name="item">The item to be registered</param>
public void RegisterItem(Renderable item)
{
_renderables.Add(item); // Add an item to the register.
}