USD - External Hosted Application, new frames and dialogs

I am trying to run a Java Swing desktop application embedded in USD and have come up against a few issues.

The application has this behaviour
1. Loads up a modal login dialogue
2. If successful login, that dialog is closed and the main application frame is shown
3. The frame acts like a MDI application, but can launch modal and non-modal wizards for some processes.

Current Situation
1. I can get the initial login dialog to show in a tab.  But once I login then main frame then pops outside of USD.
2. I can fudge the login as part of testing, the main frame now shows up inside a USD tab.  But now any wizard I launch runs outside USD.

So I can only capture or acquisition the first window.  How do I get all the others?  Why doesn't USD capture all windows and dialogs for a process?

Any options or settings I should be looking at?  Anyone had a similar situation with a Java or win32 application like this?