| ||77|| Widget:: Represents classes and their content (instance variables, categories, and methods). Elements can be extended to show more information (click), highlighted (click, blue highlight color, see also toggle labels button), and extracted to create a new widget (drag'n'drop). Furthermore, classes in the same hierarchy can be merged (drag'n'drop of widgets) in order to densify the diagram. Besides standard class widgets, we offer also collection widgets. These summarize elements that are used in collections. For example, an instance variable has an ordered collection of integers. They offer the same functionality but look a bit different than the UML notation for collections.