Jurisdiction over several causes of action established if one cause is established

Central Sun Mining Inc. v. Vector Engineering Inc., 2013 ONCA 601:

[25]       Van Breda also says, at para. 99, that where an action involves several claims, it is enough that one of those claims is presumptively connected with Ontario.  This gives the Ontario court jurisdiction over all the claims in the action, subject to a rebuttal of the presumption.  Anything else, the Supreme Court says, would be incompatible with fairness and efficiency.