Создание объектов любого типа

unit Unit1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Grids, DBGrids, ExtCtrls, DBCtrls, DB, DBTables;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  public
    NextTop: integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  NewObj: TControl;
  NewClass: TPersistentClass;
begin
  NewClass := FindClass(Edit1.Text);
  NewObj :=
    TControl(TComponentClass(NewClass).Create(Self));
  NewObj.Parent := Self;
  NewObj.Name := NewObj.ClassName + IntToStr(NextTop);
  NewObj.Top := NextTop;
  NextTop := NextTop + 20;
end;

initialization
  RegisterClasses([TButton, TEdit, TLabel]);
end.