I don't have much experience on Flex, and I met this problem
when I try to open my mxml on Tomcat, while it works pretty cool in
the Flex builder SDK:
Could not resolve <mx:AdvancedDataGrid>
My flex build version is version 3.0 (bulid 3.0.194161) while
my lcds version is Flex 2.0.1 Hotfix 2 build 166910 (according to
flex-sdk-description.xml). I know that ADG is a part of new feature
in Flex 3, and my LCDS environment is not compatable.
I saw some articles about this problem and tried several
ways, say like copy the datavisualization.swc into the lib
directory under project, but doesn't work.