<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/12/17/setting-tracking-on-a-textbox-object-in-flex-gumbo/ -->
<Application name="TextBox_trackingLeft_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Script>
        <![CDATA[
            import mx.events.SliderEvent;

            private function slider1_change(evt:SliderEvent):void {
                textBox.setStyle("trackingLeft", evt.value);
            }

            private function slider2_change(evt:SliderEvent):void {
                textBox.setStyle("trackingRight", evt.value);
            }
        ]]>
    </Script>

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="trackingLeft:">
                <HSlider id="slider1"
                        minimum="0"
                        maximum="20"
                        value="0"
                        snapInterval="1"
                        tickInterval="1"
                        liveDragging="true"
                        change="slider1_change(event);" />
            </FormItem>
            <FormItem label="trackingRight:">
                <HSlider id="slider2"
                        minimum="0"
                        maximum="20"
                        value="0"
                        snapInterval="1"
                        tickInterval="1"
                        liveDragging="true"
                        change="slider2_change(event);" />
            </FormItem>
        </Form>
    </ApplicationControlBar>

    <Box backgroundColor="haloSilver" backgroundAlpha="0.4">
        <Graphic>
            <TextBox id="textBox"
                    text="The quick brown fox jumps over the lazy dog."
                    textAlign="justify"
                    textJustify="interWord"
                    fontSize="16"
                    width="400" />
        </Graphic>
    </Box>

</Application>