the atlas the regions are read from
Optionalinsetxthe width of a corner kept unscaled, in pixels; a quarter of the region's width by default
Optionalinsetythe height of a corner kept unscaled, in pixels; a quarter of the region's height by default
the name of the atlas region drawn as the background
The art of a skinned UIPanel: one atlas region, drawn as a nine-slice over the whole panel and stretched with it.
Example