[Lazarus] TForm.CreateNew - form hides not immediately

[Alexey Tor.]

Linux gtk2.

   Form:= TForm.CreateNew(Application.MainForm);
   Form.Visible:= FOption;

if FOption=False, form flickers! it appears for 0.2sec and hides. Can we 
avoid flicker and just hide?
Maybe AVisible param can be added to CreateNew?

It is so on all widgetsets?

-- 
Regards,
Alexey