Using states to control the display of the popup component.
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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:HorizontalLayout />
</s:layout>
<fx:Style>
.popUpBox {
backgroundColor : #e9e9e9;
borderStyle : "solid";
paddingTop : 2;
paddingBottom : 2;
paddingLeft : 2;
paddingRight : 2;
}
</fx:Style>
<s:states>
<s:State name="normal" />
<s:State name="emailOpen" />
</s:states>
<s:transitions>
<mx:Transition fromState="*" toState="*">
<mx:Sequence>
<s:Fade target="{emailPopUp.popUp}" duration="250" />
</mx:Sequence>
</mx:Transition>
</s:transitions>
<s:Group x="60">
<s:Button label="Send email" click="currentState = 'emailOpen'" />
<s:PopUpAnchor id="emailPopUp" left="0" bottom="0" popUpPosition="below"
styleName="popUpBox" includeIn="emailOpen"
displayPopUp.normal="false" displayPopUp.emailOpen="true">
<mx:Form>
<mx:FormItem label="From :">
<s:TextInput />
</mx:FormItem>
<mx:FormItem label="To :">
<s:TextInput />
</mx:FormItem>
<mx:FormItem label="Subject :">
<s:TextInput />
</mx:FormItem>
<mx:FormItem label="Message :">
<s:TextArea width="100%" height="100" maxChars="120" />
</mx:FormItem>
<mx:FormItem direction="horizontal">
<s:Button label="Send" click="currentState = 'normal'" />
<s:Button label="Cancel" click="currentState = 'normal'" />
</mx:FormItem>
</mx:Form>
</s:PopUpAnchor>
</s:Group>
</s:Application>
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