Can the dishes be used in my oven?The glass dishes may be used in ovens up to 400°F or in a microwave oven. DO NOT PLACE THE COVERS IN THE OVEN, AS DAMAGE TO THE KNOBS WILL OCCUR. The stainless steel metal dish may be used in a conventional or convection oven up to 400°F. DO NOT USE THE COVERS IN THE OVEN AS DAMAGE TO THE KNOB WILL OCCUR. If you need to cover the dishes when being used in a conventional oven use aluminum foil. To cover the glass dishes in a microwave oven use plastic wrap or waxed paper. DO NOT use the stainless steel dish in a microwave oven.