static void Main()
    {
        var item1 = new SomeBase();
        var item2 = new SomeDerived();
        var items = new List <ISomeInterface> {
            item1, item2
        };
        ISomeInterface group = GroupGenerator.Create(items);

        group.SetSomeBool(true);
        Console.WriteLine(item1.SomeBool);     // true
        Console.WriteLine(item2.SomeBool);     // true
        group.SetSomeBool(false);
        Console.WriteLine(item1.SomeBool);     // false
        Console.WriteLine(item2.SomeBool);     // false
    }
 public SomebaseWrapper(SomeBase b)
 {
 }