[NumLock]

Код:

unit Unit1;

interface

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

type
  TDragPanel = class(TPanel)
  private
    procedure WMLBUTTONDOWN(var Message: TMessage); message WM_LBUTTONDOWN;
  end;

  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

const
  SC_DRAGMOVE = 61458;

{ TDragPanel }

procedure TDragPanel.WMLBUTTONDOWN(var Message: TMessage);
begin
  ReleaseCapture;
  SendMessage(Handle, WM_SYSCOMMAND, SC_DRAGMOVE, 0);
end;

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  with TDragPanel.Create(Self) do
  begin
    Parent:=Self;
    Caption:='Drag me...';
  end;
end;

end.