ActionScript classes correspond to MXML tags. When a Flex application is created, Flex analyzes the MXML tags by generating corresponding ActionScript classes.
<mx:TitleWindow width="305" height="500" layout="absolute" title="Title Window" showCloseButton="true" top="58" backgroundColor="#BFBFBF" horizontalCenter="-350">
<mx:TabNavigator x="0" y="0" width="100%" height="100%" borderStyle="none"
<mx:Canvas label="Form Elements" width="100%" height="100%"
<mx:CheckBox x="10" y="74" label="Checkbox"/>
<mx:NumericStepper x="103" y="72"/>
<mx:RadioButton x="10" y="41" label="Radio"/>
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<mx:TitleWindow width="305" height="500" layout="absolute" title="Title Window" showCloseButton="true" top="58" backgroundColor="#BFBFBF" horizontalCenter="-350">
<mx:TabNavigator x="0" y="0" width="100%" height="100%" borderStyle="none"
<mx:Canvas label="Form Elements" width="100%" height="100%"
<mx:CheckBox x="10" y="74" label="Checkbox"/>
<mx:NumericStepper x="103" y="72"/>
<mx:RadioButton x="10" y="41" label="Radio"/>
…..
……
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