Flex 4 in brief

Flex 4 – Useful Links

The work on the Flex SDK has been focused around three primary themes:

• Design in Mind: providing a framework that supports a new degree of expressiveness, easily enabled with tools.
• Developer Productivity: improving compiler performance and adding productivity enhancements to language features like data binding.
• Framework Evolution: taking advantage of new Flash Player capabilities and adding features required by common use-cases.

Player dependency

Be sure that you compile against Flash Player 10. The Flex 4 SDK requires Flash Player 10 support.

Type selectors require a namespace

A CSS type selector names the Flex class to style. For example, the following are type selectors for Button and DateField:

Theme change

The default theme for Flex 3 (MX) components is now the Spark theme. Therefore, your application may look and size itself differently when you compile it using the Flex 4 SDK.

Automation Library location change

In Flex 3, automation libraries were present under {sdk}/frameworks/libs and in the Flex 4 , it is available under {sdk}/frameworks/libs/automation.