editorOne.open();
[...]
editorOne.setVisible( false );
editorTwo.open()
[...]
editorTwo.setVisible( false );
editorOne.setVisible( true );

	 public static void hideEditor( IWorkbenchPage page, IEditorReference ref) {
		 
//	    if (!(this.editorPresentation.containsEditor((EditorReference)ref))) {
//	      return;
//	    }

		 // this.editorPresentation.closeEditor(ref);
		 
		 Field field = FieldUtils.findField( page.getClass(), "editorPresentation");
		 Object obj = FieldUtils.get( page, field );
		 Method method = MethodUtils.findMethod( obj.getClass(), "closeEditor", new Class[] { IEditorReference.class } );
		 MethodUtils.invoke( obj, method, ref );

		 // this.activationList.remove(ref);

		 field = FieldUtils.findField( page.getClass(), "activationList");
		 obj = FieldUtils.get( page, field );
		 method = MethodUtils.findMethod( obj.getClass(), "remove", new Class[] { IEditorReference.class } );
		 MethodUtils.invoke( obj, method, ref );

	    //updateActivePart();
		 		 
		 method = MethodUtils.findMethod( page.getClass(), "updateActivePart", new Class[0] );
		 MethodUtils.invoke( page, method );

		 IEditorPart editor = ref.getEditor(false);
		 if( editor != null ) {
			 SaveablesList modelManager = (SaveablesList) editor.getSite().getService(ISaveablesLifecycleListener.class);
			 Object result = modelManager.preCloseParts( Arrays.asList(editor), true, editor.getEditorSite().getWorkbenchWindow() );
			 modelManager.postClose( result );
		 }
		 
	  }

	 public static void showEditor( IWorkbenchPage page, IEditorReference ref) {
		 
//		    if (!(this.editorPresentation.containsEditor((EditorReference)ref))) {
//		      return;
//		    }

			 // this.editorPresentation.addEditor((EditorReference)ref, "", false);
			 
			 Field field = FieldUtils.findField( page.getClass(), "editorPresentation");
			 Object obj = FieldUtils.get( page, field );
			 Method method = MethodUtils.findMethod( obj.getClass(), "addEditor", new Class[] { EditorReference.class, String.class } );
			 MethodUtils.invoke( obj, method, ref, "" );

			 // this.activationList.add(ref);

			 
			 field = FieldUtils.findField( page.getClass(), "activationList");
			 obj = FieldUtils.get( page, field );
			 method = MethodUtils.findMethod( obj.getClass(), "add", new Class[] { IEditorReference.class } );
			 MethodUtils.invoke( obj, method, ref );

		    //this.removedEditors.add(ref); TODO
		    
		    //updateActivePart();
			 		 
			 method = MethodUtils.findMethod( page.getClass(), "updateActivePart", new Class[0] );
			 MethodUtils.invoke( page, method );

		  }