DVT e Language IDE User Guide
Rev. 16.1.36, 10 February 2017
A diagram is created around a set of relevant structs you specify. For example when you decide to show parents, children or associations (from Class Diagrams - Preferences) it applies only to selected structs. In a diagram the selected structs are colored with yellow fill (see also the Class Diagrams - Legend ).
The right list shows the selected structs. Use left/right arrows or double click to select the relevant classes.
You can also add/remove an element to/from the current selection by right clicking on it in the diagram and choosing "Select type"/"Deselect type":