By Nichola Groom Reuters Mon Mar 19, 2007 10:04 PM BST LOS ANGELES (Reuters) - Starbucks Corp. (SBUX.O: Quote , Profile , Research ) management, facing a battered share price and concerns about dilution of its brand, is expected to reassure investors at its annual meeting this week that its aggressive growth plans are still on track. Since hitting an all-time high in November, Starbucks shares have lost more than 20 percent as investors fret over profit margins that have lagged expectations and, most recently, a high-profile memo in which Chairman Howard Schultz warned of the "commoditization" of its iconic brand. Investors are eager for the company to address those concerns at Wednesday's meeting in Seattle. "Will management boost investor confidence with hints of current trends, announce more aggressive share repurchase intentions, discuss compelling innovation or offer other meaningful commentary?" UBS analyst David Palmer wrote to clients on Monday...