using System;

public class Program

{

    public class TableLayoutPanel{

        public virtual void SayHello(){

            Console.WriteLine("Hello TableLayoutPanel");

        }

    }

    public class MyTableLayoutPanelBase : TableLayoutPanel

    {

        public override void SayHello(){

            Console.WriteLine("Hello MyTableLayoutPanelBase");

        }

    }

​

    public class MyTableLayoutPanelExt : MyTableLayoutPanelBase

    {

        public override void SayHello(){

            Console.WriteLine("Hello MyTableLayoutPanelExt");

        }

    }

​

    public class MyTableLayoutPanelUltraExt : MyTableLayoutPanelExt

    {

        public override void SayHello(){

            Console.WriteLine("Hello MyTableLayoutPanelUltraExt");

        }

    }

    public static T CreateMyTableLayoutPanelControl<T>() 

    where T : TableLayoutPanel

    {

        return Activator.CreateInstance<T>();

    }

    public static void Main()

    {

        MyTableLayoutPanelExt myTableLayoutPanelControlExt = CreateMyTableLayoutPanelControl<MyTableLayoutPanelExt>();

        myTableLayoutPanelControlExt.SayHello();

    }

}