Setting the thumb color based on the current value of a Spark HSlider control in Flex 4

The following example shows how you can set the thumb color on a Spark HSlider control in Flex 4 by listening for the change and valueCommit events and setting the chromeColor style on the thumb skin part.

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_HSlider_thumb_chromeColor_test"
        <s:Button label="Set value"
                click="sldr.value = int(Math.random() * sldr.maximum);" />
            protected function sldr_changeHandler(evt:Event):void {
                var clr:Object = "red";
                if (sldr.value >= 8) {
                    clr = "haloGreen";
                } else if (sldr.value >= 6) {
                    clr = "yellow";
                sldr.thumb.setStyle("chromeColor", clr);
    <s:HSlider id="sldr"
            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.