void Attach() { _sourceProperty.Attach(OnSourceChanged); _fallbackSourceProperty.Attach(OnFallbackSourceChanged); _stretchProperty.Attach(OnArrangeGetsInvalid); _stretchDirectionProperty.Attach(OnArrangeGetsInvalid); _thumbnailProperty.Attach(OnArrangeGetsInvalid); _skinNeutralProperty.Attach(OnArrangeGetsInvalid); WidthProperty.Attach(OnImageSizeChanged); HeightProperty.Attach(OnImageSizeChanged); }