The XD++ Class Library is a set of classes built on the Microsoft Foundation Classes. Xtreme Diagram++ was designed from the start to be a reusable class library. XD++ supports Documents, Views, and Graphical Objects such as rectangles, ellipses, polygons, metafiles, text, bitmaps, and lines. Objects can be grouped together in a hierarchical structure, forming arbitrarily complex visual objects from basic XD++ objects.With XD++ add in tool you can easy definition of specialized graphical objects containing other objects