Use setStyle() method, set it inline, or use Cascading Style Sheets (CSS)

       

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    <!-- skins/SimpleButtonGraphicSkin.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">
    <fx:Style>
        @namespace mx "library://ns.adobe.com/flex/mx";
        mx|Button {
        upSkin: Embed("a.gif");
        } 
</fx:Style>
    <mx:Button id="b1" label="Click Me" />
</s:Application>

1.	Using setStyle to programmatically manipulate a style property
2.	Use setStyle to change font size
3.	Use setStyle to change font style
4.	Cast target to a UIComponent before calling the setStyle() method
5.	Use setStyle() method
6.	Using the setStyle() method to apply graphical skins
7.	Using setStyle() method with a trigger
8.	Use the setStyle() method to apply the custom class to the item renderer.
9.	Use getStyle() with effects defined in MXML
10.	Use getStyle() with behaviors defined in MXML
11.	Set a style property inline, and then reads that property with the getStyle() method

Use setStyle() method, set it inline, or use Cascading Style Sheets (CSS) : Style Get Set « Style « Flex

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