The Explorer pane is always in sync with the actual project. And the code in the Editor pane is always in sync with the model class diagrams. In this part of the tour, you will look at the connections between the Explorer pane and the Diagram and Editor panes. And you will examine the project presentation in the Diagram and Editor panes to see how closely knit the two views are. The context for all of our discussions is the sample CashSales project.
Every project has a top-level default diagram.
Unless you change its properties, the first time you open a project, the default diagram opens in the Diagram pane. Diagrams can be opened in the Diagram pane only from within their projects. This opens the diagram in a new tab without closing the current one. There are different types of diagrams, each with an associated icon. Together's UML diagram icons are abstractions of actual diagrams.