type
  TForm1 = class(TForm)
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    TabSheet2: TTabSheet;
    TabSheet3: TTabSheet;
  private
    {Private declarations}
    procedure CMDialogChar(var Msg:TCMDialogChar);
    message CM_DIALOGCHAR;
  public
    {Public declarations}
  end;

var
  Form1: TForm1;

implementation
{$R *.DFM}

procedure TForm1.CMDialogChar(var Msg:TCMDialogChar);
var
  i: integer;
begin
  with PageControl1 do
  begin
    if Enabled then
      for i := 0 to PageControl1.PageCount - 1 do
        if ((IsAccel(Msg.CharCode, Pages[i].Caption)) and
        (Pages[i].TabVisible)) then
        begin
          Msg.Result:=1;
          ActivePage := Pages[i];
          exit;
        end;
  end;
  inherited;
end;