unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  MyRect: TRect;
begin
  MyRect := ActiveControl.BoundsRect;
  MyRect.Right := MyRect.Left + 2 * (MyRect.Right - MyRect.Left);
  MyRect.Bottom := MyRect.Top + (MyRect.Bottom - MyRect.Top) div 2;
//  ActiveControl.BoundsRect := MyRect;
end;

end.