Use a pseudo selector to change the appearance of the button when it is in the up, down, and over states

       

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    <!-- styles/PseudoSelectorExample.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:custom="*">
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
        s|Button:up {
            baseColor: black;
            color: #FFFFFF;
        }
        s|Button:over {
            baseColor: gray;
            fontWeight: "bold";
            color: #FFFFFF;
        }
        s|Button:down {
            baseColor: blue;
            fontWeight: "bold";
            color: #FFFF66;
        } 
    </fx:Style>
    <s:Button label="Click Me" x="10" y="35" />
</s:Application>

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Use a pseudo selector to change the appearance of the button when it is in the up, down, and over states : Button Style « Components « Flex

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