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NavDialog Question

I have an application where many windows are mutually dependent. Some window subscribes to data in other windows. If a user tries to close a data source window, and other windows subscribe to data in the data source window, the application must first close the subscribers (since these cannot live without the data). The subscribers may again subscribe to other data sources which may or may not have data stored to disk (and the subscribers cannot be stored before all data sources have associated files [The subscribers store Alias records to the data source files for re-opening] ). Hence, the closing of one window will trigger a fixed sequence of window closures/saves (with possible cancels). During this application state, the sequence cannot be broken and each close dialog must be application modal. Still, sheets are the best way to clearly show which window is currently associated with the Navigation dialogs. Unfortunately I have problems of changing the modality of the sheets (after creation during the Nav start callback, since NavDialogRun returns Parameter error if I do so.

Do anybody know of a safe way to use the Navigation services with sheets, and forcing the sheets to be application modal rather than window modal. I feel that sheets are much better in the above situation, and there will be more and more applications which have more complex "Document / Window" relationships than what the window modal metaphor was primarily designed for.

Johan
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