Extensible infrastructure for representing networks including virtual machines

One or more embodiments provide an extensible user interface for navigating a graph in a tabular format for which the extensible user interface is arranged in a hierarchy of views. The hierarchy includes an entry point level having at least one extension added by an application, wherein data is displayed when the extensible user interface is initially accessed by the user. The hierarchy further includes an inventory level having at least one extension added by the application, wherein data is displayed when the user selects an extension at the inventory level. Another level of the hierarchy is a category extension level having at least one extension added by an application, wherein data is displayed when the user focuses the extensible user interface on a node displayed by an extension added at the inventory level.