public void load()
{
all = new CompoundGraphic();
all.Add(new Dot(1, 2));
all.Add(new Circle(5, 3, 10));
//...
}
/// <summary>
/// combine selected components into one complex composite
/// component.
/// </summary>
/// <param name="components"></param>
public void GroupSelected(List <IGraphic> components)
{
var group = new CompoundGraphic();
group.Add(components);
all.Remove(components);
all.Add(group);
all.Draw();
}