Great exception! But it works only with Table, not with CustomTable, and so

Great exception!
But it works only with Table, not with CustomTable, and some extensions (FilteringTable, for example) can;t be exportable without hacks.
Could you provide opportunity to export CustomTables too?

Since the 1.5.1.2 release it should work with filtering table. There’s a discussion of this on the forum - https://vaadin.com/forum/-/message_boards/view_message/579716. If it doesn’t work please post the specifics of the issue on the forum.