ActionScript 3.0 Tip of the Day

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The release of Flex Builder 2 is around the corner and though the next version of Flash is still a ways away, ActionScript 3 will be a big part of Flex 2 and the impending release of Flash Player 9.  ActionScript 3 is the next step forward and to help with the transition (for those of you deciding to make it), I thought, since I've been working with AS3 a bit lately, I'd make a new [b]Tip of the Day[/b] thread for [b]ActionScript 3[/b].

Tips:
[list=1]
[*][font=courier]06-14-06: [/font] 
[/list]

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- package keyword
- [adv] local file access
- helper classes
- definitions in class body are now unique to instances (check)
- function scripts
[v] scope binding (class method scope cannot be changed even using call/apply)
- constants
[v] stage.framerate
- stage background color
- mouseEnabled and mouseChildren for sprites as buttons and textfields
- xml
- flash.utils.describeType
- new keywords/operators (as, for each ...)
- Void is now void
- new events
- Timer class
- SimpleButton
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ActionScript 3 now supports a new class called SimpleButton (flash.display.SimpleButton).  This class lets you create button symbols in ActionScript - something previously not possible older versions of ActionScript.
[as]var myButton:SimpleButton = new SimpleButton();[/as]
The SimpleButton class contains 4 properties that relate to the various states of a button; upState, overState, downState, and hitAreaState.  Create display objects for these states and assign them to those properties to create a fully functional simple button using ActionScript 3.
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