unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TForm1 = class(TForm)
    procedure WMShowWindow(var Msg: TWMShowWindow); message WM_SHOWWINDOW;
    procedure WndProc(var msg: TMessage); override;
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.WndProc(var msg: TMessage);
var bla: Integer;
begin
 if (not (msg.wparam =  SC_MINIMIZE)) then inherited;
end;

procedure TForm1.WMShowWindow(var Msg: TWMShowWindow);
begin
  if not Msg.Show then
    Msg.Result := 0
  else
    inherited;
end;

end.