The Types tab is used to select the Object, Relationship and Role types of the modeling language. The Types tab has three lists (see Figure 2–7), Relationship, Role and Object lists, each containing items of that type in this graph type. Each list has a menu, which allows you to Add... a new type or Delete the selected type from the graph type. You can also open the appropriate tool for the selected type by double clicking the type, or by selecting Edit Type from the pop-up menu. To open Symbol Editor for the selected type, hold down the Shift key and double click the type, or select Edit Symbol from the pop-up menu.

The order of types in the Relationship and Objects lists determines the order in the types toolbar in the Diagram and Matrix Editors. You can re-order elements simply by dragging them. To sort them alphabetically, select Sort Alphabetically from the pop-up menu.

The types specified here have two functions: firstly, they determine what types are visible in the Types menu and Toolbar of editors. Secondly, while the Types tab allows you to add any type from any open project, in the Bindings tab (described in Section 2.5.4 below), you can add only those types selected in the Types tab, plus their ancestors. This makes the selection dialogs shorter, making defining bindings, constraints, decompositions and explosions easier.