A method, system, and a computer program product that enables a second window opened on a display screen to \u201cflow\u201d into and filloccupy all available space within the displayable area of the display screen without overlapping a first window occupying less than the maximum width andor length of the display area. At least one lower circuit layer is disposed overlying the substrate, wherein the lower circuit layer is a layout of circuit under pad. An n-type epitaxial region is provided in a surface layer of the p-type semiconductor substrate on the outer side of the n-type isolation region, and a p-type GND region of a ground potential is provided on the outer side of the n-type epitaxial region.