Applying styles to different states on a Spark Button control in Flex 4

The following example shows you how you can use the advanced CSS features in Flex 4 to apply different state-specific styles to a Spark Button control using CSS.

For more information on using advanced CSS, see the “CSS Advanced Selectors” specification on the Adobe Flex Open Source site.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see To download the latest nightly build of the Flex 4 SDK, see

For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- -->
<s:Application name="Spark_Button_CSS_states_test"
        @namespace s "library://";
        s|Button {
            baseColor: haloBlue;
            color: white;
        s|Button:over {
            baseColor: haloGreen;
            color: black;
        s|Button:disabled {
            baseColor: haloSilver;
            color: red;
    <s:CheckBox id="checkBox"
            left="10" top="10" />
    <s:Button id="btn"
            label="Spark Button"
            horizontalCenter="0" verticalCenter="0" />

View source is enabled in the following example.

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

2 thoughts on “Applying styles to different states on a Spark Button control in Flex 4

  1. Button skin has 4 states, which (as written in sample) are accessible in CSS using colon notation like s|Button:over

    Can such notation be used with any custom skin with custom states defined inside ? Like CustomComponent:customState or .customStyle:customState.


Comments are closed.