Popup Window Focus

I need to create a small Popup window which will contain a number of controls (not necessarily controls with handles). The Popup Window must be able to overlap the Parent Form border, in a similar manner to a Combobox's drop down portion.

(Note the Popup Window is NOT a ListBox, though, in principle, it could contain a ListBox as one of it's controls).

Now, the part I'm having difficulty with: When you click on a control in the Popup window the Parent Form **must** retain focus. The Popup Window must stay open and on top of the Parent Window until manually closed.

At present I'm using the following code in the CreateParams:

procedure TPopupWindow.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.Style := Params.Style or ES_MULTILINE or WS_POPUP;
end;

And this to return Focus to the main form when a control is pressed:

procedure TPopupWindow.ControlPressed(Sender: TObject);
begin
  FMainForm.SetFocus;

 // ... More code to handle the mouse click or keyboard input ...

end;

When you click on a control in the Popup Window the Parent Form looses focus which causes a "flashing effect" of the Parent Form's border when I programmatically return focus to it.

Other info:

The Popup Window does *not* have a Caption. Does *not* have BorderIcons or in fact a Border. The Popup Window's background must be opaque when both inside and outside the Parent Forms boundaries.
JQLAsked:
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Ivanov_GCommented:

   in the constructor you send The form handle.

  constructor TPopupMenu.Create (...your params here...; FormHandle : THandle);
  begin
     ......
  end;

  in the constructor you set FormStyle := FormStyle + [fsStayOnTop];

  procedure TPopupMenu.ShowPopup(....your params here...);
  begin
    Show;
    .....
    // activate the form using it's handle
    SendMessage(FormHandle, WM_ACTIVATE, 0, 0);
  end;
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