THintWindow always on top of everything

I'm using Delphi 5 under Win2K

I made my own class of hint where the user has to click on a button to close
the hint.
My problem is that an object of this class(derived from THintWindow) is
always over everything on my screen. If i minimize my application with one
of those hint visible, it stays on top of all other applications on my
computer.

I've tried things like overriding CreateParams

  inherited CreateParams(Params);
  with Params do
  begin
    WndParent := TForm(Owner).Handle;
    Style := Params.Style or WS_OVERLAPPED;
  end;
what usually works for forms

Does anyone got an idea of how i can make my hints on top of the form that
is calling it only?

thanks in advance

Charles