Create a Spark Button control in MXML.

          

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<!-- components\ButtonApp.mxml -->
<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:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        public function handleClick():void { 
            text1.text="Thanks for the click!"; 
        } 
      
    </fx:Script>
    <s:Button id="button1" label="Click here!" width="100" fontSize="12"
        click="handleClick();" />
    <s:TextArea id="text1" />
</s:Application>

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Create a Spark Button control in MXML. : Spark component « Components « Flex

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