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When I'm looking at certain objects on the UML diagram window and I want to print just what's in the visible window, there's no way to do that. There's should be an option from the printing.
Print manager prints component marked as "print.printable" and invokes print() method of the component for preview and printer output. So, it is up to UML component which data will be passed to the Print Manager. Also method printAction(PrintProvider [] providers) can be used to specify the pages directly.