[Alegun]

Можно так

Код:

procedure ClickOnForm(wnd: HWND; caption: string);
var
TheChildHandle: HWND;
begin
TheChildHandle := FindWindowEx(wnd, 0, nil, PChar(caption));
SendMessage(TheChildHandle, WM_LButtonDown, 1, 1);
SendMessage(TheChildHandle, WM_LButtonUP, 1, 1);
end;

procedure TForm1.Button4Click(Sender: TObject);
var
wnd: HWND;
caption: string;
begin
wnd := GetTopWindow(0);

repeat
   SetLength(caption, GetWindowtextLength(wnd));
   GetWindowText(wnd, @caption[1], length(caption) + 1);
   if (trim(caption) = 'Заголовок формы') then ClickOnForm(wnd, 'Имя кнопки');
   wnd := GetNextWindow(wnd, GW_HWNDNEXT);
until wnd = 0;
end;//Drkb 02109