Vertically aligning labels in a Spark Button control in Flex 4

The following example shows how you can vertically align a Spark Button control’s label in Flex 4 by setting the verticalAlign style on the Button control’s internal labelDisplay object.

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_verticalAlign_test"
            import flashx.textLayout.formats.VerticalAlign;
            protected function btnBar_change(evt:IndexChangeEvent):void {
                var value:String = btnBar.itemToLabel(btnBar.selectedItem);
                btn.labelDisplay.setStyle("verticalAlign", value);
    <mx:ApplicationControlBar width="100%" cornerRadius="0">
        <mx:Form styleName="plain">
            <mx:FormItem label="verticalAlign:">
                <s:ButtonBar id="btnBar"
                            <fx:Object label="{VerticalAlign.TOP}" />
                            <fx:Object label="{VerticalAlign.MIDDLE}" />
                            <fx:Object label="{VerticalAlign.BOTTOM}" />
                            <fx:Object label="{VerticalAlign.JUSTIFY}" />
    <s:Button id="btn"
            label="The quick brown fox jumps over the lazy dog"
            width="100" height="100"
            horizontalCenter="0" verticalCenter="0"
            creationComplete="btn.labelDisplay.maxDisplayedLines = 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.

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