public TwoLineTextBlockControl() { _fontOptions = new FontOptions(); _fontObserverDisposer = _fontOptions.Observe(this); _fontOptions.PropertyChanged += FontOptionsOnPropertyChanged; _textMeasure = TextMeasureHelper.GetTextMeasure(new FontOptionsStruct(_fontOptions)); _panel = new TwoLineTextBlockPanel(CreateTextBlock(), CreateTextBlock()); ChildInternal = _panel; }