Glendening tied it 1-1 at 7:45 of the second period, knocking in a rebound with a backhand for his first goal in 19 games.
Robertson scored off the rebound of a Hintz shot to give the Stars a 2-1 lead at 11:06.
Glendening tipped Biega's point shot to tie the game 2-2 at 16:55 of the second.
"I haven't gotten many goals this year or last year, so getting two tonight was a nice way to help the team," Glendening said. "We know we're going to have three more games like this, and we have to find a way to be a little better."
NOTES:Dallas defenseman John Klingberg had an assist to extend his point streak to five games (one goal, five assists). … Robertson has six points (two goals, four assists) during a four-game point streak. … It was Glendening first two-goal game since Jan. 22, 2019, and his fourth in 545 NHL games.