Flex 3 to 4
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Transitioning
About You have arrived at this page because InsideRIA is no longer an active website, as of January 31, 2011. While we're sad to see the change, we think you will find the resources and community here at oreilly.com helpful. An archive of the material previously posted on InsideRIA can be found at DevelopRIA.com .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.. Some style can be valid for only one theme but not the other.
Styles & 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
Flex 4 Backwards Compatability
The following changes will revert back to their Flex 3 behavior if you compile your application using the compiler option -compatibility-version=3.0.0. width, height, explicitWidth, explicitHeight, explicitMinWidth, explicitMinHeight, explicitMaxWdith, explicitMaxHeight, measuredWidth, measuredHeight, measuredMinWidth, measuredMinHeight
new default RSLs
A runtime shared libary that has been signed by Adobe and can be stored in the Player Cache. By convention signed RSLs have a .swz extension. Linking RSLs by default means when we build an application swf, classes in framework.swc will not be included in the application.