How to add Xtext DSL editor in Multi-Page Editor
To add your Xtext Dsl Editor to Multi-Page Editor Getting the instance of XText editor MyDslActivator activator = MyDslActivator.getInstance(); final Injector injector = activator.getInjector("org.shashwat.xtext.mydsl.MyDsl"); XtextEditor xtextEditor = injector.getInstance(XtextEditor.class); Remember to have editor input instance of IFileEditorInput. XtextEditor uses XtextDocumentProvider which extends FileDocumentProvider FileEditorInput fileEditorInput = new FileEditorInput(file); // Here file is instance of IFile int index = addPage(xtextEditor, fileEditorInput);