unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    procedure WM_MouseActivateEvent(var Message : TWMMouseActivate); message WM_MouseActivate;
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

{ TForm1 }

procedure TForm1.WM_MouseActivateEvent(var Message: TWMMouseActivate);
begin
  Message.Result := MA_NOACTIVATE;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  WindowState := wsMaximized;
  BorderStyle := bsNone;
end;

end.