How to capture an event using PM file that user is navigating to another view?

Hi,

We would like to know how can we capture an event or notification that user has clicked on a tab to navigate to another view.

We want to alert user to perform Submit operation before navigating to another View.

Scenario:

User is on a View which has a Form Applet.

User enters data into all the mandatory fields.

Data gets saved, but the form needs to be submitted.

If user tries navigate to another view, we want to alert (dialog box) user to perform the Submit operation.

If user selects NO button in dialog box ... user will be navigated to another view.