unit Demo;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls, Menus;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Label1: TLabel;
    Panel1: TPanel;
    GroupBox1: TGroupBox;
    MainMenu1: TMainMenu;
    asdf1: TMenuItem;
    sdaf1: TMenuItem;
    asdf2: TMenuItem;
    asd1: TMenuItem;
    f1: TMenuItem;
    sad1: TMenuItem;
    er1: TMenuItem;
    sdf1: TMenuItem;
    g1: TMenuItem;
    sdfg1: TMenuItem;
    sdf2: TMenuItem;
    gsd1: TMenuItem;
    g2: TMenuItem;
    sdf3: TMenuItem;
    g3: TMenuItem;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
procedure API_Hookup; stdcall; external 'MYAPIDLL.dll';
procedure API_HookDown;  stdcall; external 'MYAPIDLL.dll';
var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  i:integer;
begin
  API_Hookup;
  Self.Repaint;
  for i:=0 to self.ControlCount-1 do
  begin
     self.Controls[i].Refresh;
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  i:integer;
begin
  API_HookDown;
  Self.Repaint;
  for i:=0 to self.ControlCount-1 do
  begin
     self.Controls[i].Refresh;
  end;  
end;

end.