[marcoszorrilla]

Mira este ejemplo:

Código Delphi [-]
unit frSinBorde;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    
  private
   private
   procedure WMNCHitTest(var Msg: TWMNCHitTest); message WM_NCHITTEST;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
procedure TForm1.WMNCHitTest(var Msg: TWMNCHitTest);
begin
 inherited;
 if Msg.Result = htClient then Msg.Result := htCaption;
end;



procedure TForm1.Button1Click(Sender: TObject);
begin
Close;
end;

end.

Un Saludo.