You can only do this with the "5.x" type of swing custom dialogs that you can do in IS 11. See the docs for "5.x Panels". In those types of panels, you create a SwingImpl class. You can make that class implement java's MouseListener interface. You can then have events in the panel class such as mouseClicked(), mouseEntered(), mousePressed(), etc.
No, in the new dialogs, the acutal UI implementation is not exposed in code, thus you do not have the ability to add listeners to the controls on the panels. The code that you write for the "new" panels is only for event code.
I suppose that it would be possible to implement a mouse listener in a custom control, which you could then add to one of the "new" types of dialogs, but that mostly would defeat the purpose of using the new dialogs instead of the 5.x dialogs.
