ocr: Window) (menu) (nonvisualobject) V ancestory (m sheet ancestor) nabstract ancestort mesnees Dswgens Wistucens figure 2. Objects used in a typical window. The bottom row represents abstract objects built into a development tool. The middle row represents the abstract classes in the application (usually in the class libraries) that contain attributes and oehavior that all descendant classes share. The top row represents the concrete classes.
