Area class is a super class for every other MUI class except windows and applications. It holds information about an object's current position, size and weight and manages frames, fonts and backgrounds.
Because Area class is the super class for every MUI gadget, you can use all of its attributes with all other MUI classes that create gadgets. For example, you can use Area.ShortHelp to add bubble help to a button, or you could use Area.ContextMenu to add a context menu to a listview, etc.