Sometimes your RCP view needs to perform some action when an editor is activated. You can present some additional information in the view depending on the element in the editor. You probably know this behavior since there is a Link to editor button in the toolbar of the Package explorer of the Eclipse IDE. After activating this button the IDE always selects the class in the tree of the view you edit in the active editor. There are no build in classes in the Eclipse RCP to implement this behavior.