HildonColorButton, GtkColorButton or...?
 

I was looking for a control usable for color selection and found two: HildonColorButton and GtkColorButton. Neither of which appear to be "optimized" for touch. When choosing a color for a calendar the calendar application uses a nice color selection UI. However I didn't see any mention of another color selection widget in the API documentation so I assume that is a custom control.

Is there a preferred control for performing color selection?