Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  In order to allow very small windows, 
  you need to override the default behavior for Windows message WM_GETMINMAXINFO. 
  This message is sent to your window by the OS in order to find out 
  the minimum and the maximum allowed window size. 
  You can do this by adding this method procedure to your form: 
}

 private
   procedure GetMinMaxInfo(var Msg: TWMGETMINMAXINFO); message WM_GETMINMAXINFO;
   { Private declarations }
 public
   { Public declarations }
 end;

 var
   Form1: TForm1;

 implementation

 {$R *.dfm}

 procedure TForm1.GetMinMaxInfo(var Msg: TWMGETMINMAXINFO);
 begin
   inherited;
   with Msg.MinMaxInfo^ do
   begin
     ptMinTrackSize.X := 0; // min. Width 
    ptMinTrackSize.Y := 0; // min. Height 
  end;
 end;

 procedure TForm1.FormCreate(Sender: TObject);
 begin
   { no systemmenu }
   BorderIcons := BorderIcons - [biSystemMenu];
   { set the form's width & height }
   Width := 80;
   Height := 60;
 end;