MultiCursor support across tabs?

[goobleplax]

I've been unable to get MultiCursor to display a vertical cursor (spanning all Matplotlib subplot rows) across several tabs.

The maintainers of Matplotlib seem not to see why this functionality would be useful, and no one else seems to have solved the problem. I've tried several approaches, but all of them only display the vertical cursor on the final tab -- not any of the previous tabs.

Help? Thanks.