// original by Steve Teixeira 

unit Dragmain;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    procedure WMNCHitTest(var M: TWMNCHitTest); message wm_NCHitTest;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMNCHitTest(var M: TWMNCHitTest);
begin
  inherited;                    { call the inherited message handler }
  if  M.Result = htClient then  { is the click in the client area?   }
    M.Result := htCaption;      { if so, make Windows think it's     }
                                { on the caption bar.                }
end;

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

end.