procedure TecPopupContainer.Resize;
begin
  inherited;
  if Assigned(Parent) then
    PostMessage(Parent.Handle, EP_SIZECHANGING, 0, 0);
end;

procedure TParamCompletion.ParentWndProc(var Message: TMessage);
begin
  if (Message.Msg = CM_CANCELMODE) and (Message.LParam <> 0)
  {$IFNDEF EC_DOTNET}
     and (TComponent(Message.LParam).Owner = Popup)
  {$ENDIF}
    then Exit;
  inherited;
end;

procedure TPopupControl.ParentWndProc(var Message: TMessage);
var msg: tagMsg;
begin
  case Message.Msg of
....
    EP_SIZECHANGING:
      if FToolHint.Visible then
        FToolHint.RefreshHintWnd;
...
  end;

  CallWndProc(FParent.Handle, _FParentWndProc, Message);
end;


procedure TecToolHint.RefreshHintWnd;
var R: TRect;
begin
  if Active and TSyntMemoPopup(Owner).Visible and (FText <> '') then
    begin
      if CalculateLayout(Constraints, FLayoutSide, FMinMaxWidth,
            IntCalcSize, TSyntMemoPopup(Owner).GetPopupRect, R)  then
        begin
          // hint activation
          UpdateBoundsRect(R);
          if Application.MainForm.HelpContext = 0 then
            ParentWindow := Application.Handle
          else
            ParentWindow := TForm(Application.MainForm.HelpContext).Handle;
          SetWindowPos(Handle, HWND_TOPMOST, R.Left, R.Top, Width, Height,
            SWP_NOACTIVATE or SWP_SHOWWINDOW{ or SWP_NOREDRAW});
          Invalidate;
        end else
          ReleaseHandle;
    end else
      ReleaseHandle;
end;