Using the Class Explorer you can locate declarations of members declared in classes and interfaces.

1. Open the Delphi Class Explorer window by choosing ViewDelphi Class Explorer.
2. In the Class Viewer pane, click a class or interface that declares the required member (field, method, property). The Member List displays members declared in the selected class/interface.
3. In the Member List pane, click some member to select it.
4. Click the right mouse button. In the appeared context menu choose the Go to Declaration item. The source file in which the selected member is declared will be opened in the text editor, the viewport will be positioned on the declaration of the selected member, and the declaration will be highlighted.