GradientButton Control
The GradientButton extends the DynamicImage so many aspects are the same, reason for you
first to read the DynamicImage documentation about Configuration, Effects and Performace.
The GradientButton is a lot like an ASP.NET ImageButton from the button point of view; it renders into an input
type image where the html src attribute value is actualy a GradientImageProvider request for a gradient image.