Flex 3 to 4
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One of the major themes in the Flex 4 SDK is "Design in Mind".
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By Gaurav, on December 19th, 2009 In Flex 3, the styles defined using the [Style] metadata were validated by the flex compiler, but styles defined in css files were not validated.. Flex 4 has multiple themes:
If you want to compile a Flex 3 project with a Flex 4 compiler your are willing to set "report-invalid-styles-as-warnings" to true (otherwise it will raise errors). by Sep 16