New York (AP) -- Shares of Las Vegas Sands Corp. slipped Wednesday as a Lehman Brothers analyst downgraded the casino operator's stock, saying it is too expensive. Analyst Felicia Hendrix wrote in a client note that she views Las Vegas Sands as a "concept" stock, based on growth opportunities in China/Asia and unknown potential in Macau. She also wrote that she can't come up with a new price target on concepts and is "uncomfortable with chasing the stock."