Where a party has participated in extensive bargaining and had agreed to bargain over a disputed issue, they have waived objection to the issue being heard in court, and they may not wait until after the hearing, past the date for timely objections over whether the issue should be heard and then raise a claim that the issue is prohibited from being the subject of collective bargaining.The 1st District Appellate Court affirmed the decision of the Illinois Labor Relations Board.Beginning in 2015, the Illinois Department of …