Across sectors, we're seeing many leading retailers cut back on their store openings due to the weakened economy. But Chipotle Mexican Grill is still growing as if gas prices are $2 a gallon and milk isn't a middle-class luxury.It still has great numbers. The chain, which has plans to open 130 to 140 new restaurants this year on top of its current 775, posted a 7.1% same-store sales increase during its second quarter - a lot of retailers would kill for right now - along with a 23% profit hike.But apparently Wall Street was not impressed. It's stock closed at $67.30 per share yesterday from a high this week of over $88.We know the chain is highly popular but were surprised to see that it hasn't tempered back its store openings a bit. At the same time, we were impressed that Chipotle's numbers have held up so well. Is Wall Street overreacting, or are we bound to see the concept get hit hard like others of late?