version 2/101030 by Erik Temple
Section - The UI frame
[The UI-frame is a framing element for the buttons that do the actual work. However, we use it as a hook on which to hang spacing and other information, and we also use it as a means to calculate the width and height of the UI elements taken together. It must be represented by a PNG file from which the width and height can be read.]
The UI-frame is an anchor-element.
The image-ID is usually Figure of UI-frame.