public DefaultColorPickerBackend ()
{
colorImage = new ColorImage (Colors.Black);
colorButton = new Button (colorImage.WithSize (38, 24));
colorButton.WidthRequest = 48;
colorButton.HeightRequest = 32;
colorButton.MinWidth = 48;
colorButton.MinHeight = 32;
colorButton.ExpandHorizontal = false;
colorButton.ExpandVertical = false;
colorButton.HorizontalPlacement = WidgetPlacement.Start;
colorButton.VerticalPlacement = WidgetPlacement.Start;
colorButton.ImagePosition = ContentPosition.Center;
colorButton.Clicked += HandleClicked;
Content = colorButton;
}