Controlling the Mc's of a loaded SWF

I have a controller.swf which loads开发者_StackOverflow an external swf into a movieclip.

news_mc = loadEvent.currentTarget.content as MovieClip;

the swf is called "news.swf" and has a movieclip on the maintimeline, frame 1 called "sb".

I have tried everything to access this such as

mews_mc.sb.alpha = 0;

but nothing works?

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have you tried:

news_mc['sb'].alpha = 0;

are you sure the news_mc and news_mc['sb'] are not null?