A method and computer program product of incrementally visualizing graphical extensible models for legacy software applications via a user interface are provided. A graph of nodes and connections showing only the highest level of details are presented. Each node that contains additional, lower level, details is shown with an expansion icon that may be selected to see additional levels of detail for the node. When selected, the user interface drills down to show the next lowest level of details for that artifact within a visual boundary of the original artifact that was expanded. Because of the nested, hierarchical nature of the model, relationships between higher level artifacts can be inferred from explicit relationships between lower level artifacts. When the node is expanded, any connections that previously connected to the higher level artifact are updated to connect to the appropriate artifact in the lower level details.