Flex 4 <mx:Component> could not resolve

Question

I am using flash builder 4 to run sample application from "Getting Started with FLEX 3", but the code can't run because there is one place that FB4 can't resolve, I guess this is because the library has been obsolete but after a tons of search I can't find the solution.

Thanks. Bin

Answer 1

With Flex4 you'll want fx:Component instead