looking for a vegetable side dish to pair with mushroom risotto, any suggestions?

I like to roast something green like broccoli or brussels sprouts till some parts are a little crispy. Just olive oil, salt and pepper. The color complements the risotto and the crispy bits are a nice textural change.

mushrm risotto is the entree or one of the sides?

Because risotto has its origin in the Veneto region of Italy I would think "terroir". Radicchio would match well; either the oblong radicchio Treviso or the globular Chioggia shape. Simply grilled and brushed with olive oil it will match well with your risotto.

I usually do a garlic,white wine stewed tomato and green been dish. I used to make it at the first restaurant I worked at as a kid in St. Louis

I usually serve risotto as a first course, or as a side dish to a roasted/braised meat/poultry dish. But the following recipes sound like a good pairing, too:

http://food52.com/recipes/25519-balsamic-roasted-shallots

http://food52.com/recipes/16471-italian-celery-and-mushroom-salad

http://food52.com/recipes/4023-absurdly-addictive-asparagus