Create a mashup (mashup A) that has a navigation button on it. The navigation button navigates to another mashup (mashup B) with a title bar and close button. Mashup B has a navigation button to mashup C, this button is set to display no title bar or close button. Mashup C has a button that triggers the close if modal event.
Display A and navigate to B. Everything works as expected ie mashup B is displayed with titlebar and close button.
Navigate from B to C. Again all ok. C is displayed with no title bar.
Press the button on C to active the close if modal event. C disappears and B is returned to focus.
At this point the title bar and close button of B disappear but the contents of B remain visible. The titlebar and close button should remain visible after mashup C is closed.