Change a Hint’s Font

When the application displays a Help Hint,
it creates an instance of HintWindowClass to represent
the window used for displaying the hint.
Applications can customize this window by creating a
descendant of THintWindow and assigning it to the
HintWindowClass variable at application startup.


type
  TMyHintWindow = class(THintWindow)
    constructor Create(AOwner: TComponent); override;
  end;


implementation

{....}

constructor TMyHintWindow.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  with Canvas.Font do
  begin
    Name := 'Arial';
    Size := Size + 5;
    Style := [fsBold];
  end;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin
  HintWindowClass := TMyHintWindow;
  Application.ShowHint := False;
  Application.ShowHint := True;
end;