unit Unit1;

interface

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

type
  TForm1 = class(TForm)
   procedure FormCreate(Sender: TObject);
  private
   { Private declarations }
   procedure WMNCHitTest(var M: TWMNCHitTest); message wm_NCHitTest;
  public
   { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.WMNCHitTest(var M: TWMNCHitTest);
begin
  inherited;
  if M.Result = htClient then
   M.Result := htCaption;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  hsWindowRegion: Integer;
begin
  hsWindowRegion := CreateEllipticRgn(50, 50, 350, 200);
  SetWindowRgn(Handle, hsWindowRegion, true);
end;

end.

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