According to Larry Nesper:
The Supreme Court of Wisconsin today, June 21, in an administrative hearing, voted to indefinitely extend the Discretionary Transfer Rule permitting state court judges to transfer cases to tribal court on their own authority. It had been scheduled for review after five years. The rule has been most extensively used by the Oneida Nation which has transferred 1400 child support cases in the last several years out of county courts and into tribal court. The order will be out by the end of the term this summer.
Comments on this rule going back to 2007 are here.