Art editor within an integrated development environment displays a related file automatically. When a user enters a command to open a first file in the editor, the editor not only displays the first file's content (in a “primary editor”) but also automatically displays a second file's content (in a “related editor”), where the second file is related to the first file. In other words, when a first file is displayed in the editor, a file that is related to the first file is automatically displayed also. If the primary editor later displays a different file, then the file shown in the related editor will likely change as well, since the file shown in the related editor will be related to the “new” file in the primary editor. In other words, whatever is displayed in the related editor “tracks” whatever is displayed in the primary editor.