public override void Remove(DrawingElement d)
{
elements.Remove(d);
}
public override void Add(DrawingElement d)
{
elements.Add(d);
}
public override void Remove(DrawingElement d)
{
System.Console.WriteLine("cannot remove from a PrimitiveElement");
}
public override void Add(DrawingElement d)
{
System.Console.WriteLine("cannot add to a Primitive");
}
public abstract void Remove(DrawingElement d);
public abstract void Add(DrawingElement d);
