[Lazarus] Need help about CreateWindowEx

[FreeMan]

Hello,
I'm trying port components from delphi to lazarus, cross platform and QT 
widgetset
CreateWindowEx On this winAPI I stoped and no info much for convert to 
widgetset. Can anyone has anyidea?
What is aqual CreateWindowEx, DestroyWindow in linux QT widgetset?
My system is Kubuntu x64 and last svn fpc & lazarus
Thank you

procedure CreateToolTip;
begin
   fhToolTip := CreateWindowEx(0, 'Tooltips_Class32', nil, TTS_ALWAYSTIP 
or TTS_BALLOON or TTS_NOPREFIX,
     Integer(CW_USEDEFAULT), Integer(CW_USEDEFAULT),Integer(CW_USEDEFAULT),
     Integer(CW_USEDEFAULT), Handle, 0, hInstance, nil);

   if fhToolTip <> 0 then
     SetWindowPos(fhToolTip, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE or 
SWP_NOSIZE or SWP_NOACTIVATE);
end;

procedure DestroyToolTip;
begin
   DestroyWindow(FHToolTip);
end;