How do i make a new file created appear in the Application Navigator?

I am doing an extension to JDeveloper..How do i make the new file that the user has created to appear in the Application Navigator?
What methods can i use?
These are my codes...but it does not work still...
File file = new File(dir ,fileName);
file.createNewFile();
FileWriter fw = new FileWriter(file, false );
PrintWriter pw = new PrintWriter( fw, true );
Workspace workspace = ctx.getWorkspace();
java.net.URL projectURL = workspace.getActiveProjectURL();
URL url = file.toURL();
Node node = new Node(url);
jpr.add(node, true);
node.open();
NavigatorManager.getWorkspaceNavigatorManager().openNavigator(ctx);
ProjectNavigatorManager.getApplicationNavigatorManager().openNavigator(ctx);
EditorManager.getEditorManager().openDefaultEditorInFrame(node.getURL());

If it's an IMAP type account then you should get an Edit button at the top of the list of folders that you currently have on your email account. If it's a POP type account then you won't get the Edit button, and you are limited to your existing folders

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