Defines the number of pixels that must be discounted from Screen's vertical resolution (Elipse Water Viewer's working area). The default value of this property is -1 (minus one), which assumes Elipse Water Viewer's window configuration (with or without a title bar, with or without a border) together with the current computer's configuration (Windows-defined border width and title bar). This property cannot be changed at run time, even if Elipse Water Viewer is inactive.