Flags for property company EMAAR, builders of Burj Dubai the world's tallest tower, are seen in Dubai, November 27, 2009. Credit ratings agency Moody's on Wednesday downgraded Emaar Properties by four notches to Ba2, placing it two notches into junk territory. REUTERS/Steve CrispReuters - Abu Dhabi, wealthy capital of the United Arab Emirates, will "pick and choose" how to assist debt-laden neighbor Dubai, a senior official said on Saturday, after fears of a Dubai default sent global markets reeling.