Requiring a user has an item selected on the FxButtonBar in Flex Gumbo

The following example shows how you can make sure that the Flex Gumbo FxButtonBar control has an item selected by setting the Boolean requiresSelection property.

Full code after the jump.

To use the following code, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder 3. For more information on downloading and installing the Gumbo SDK into Flex Builder 3, see “Using the beta Gumbo SDK in Flex Builder 3”.


<?xml version="1.0" encoding="utf-8"?>
<!-- -->
<Application name="FxButtonBar_requiresSelection_test"

            import mx.utils.ObjectUtil;

        <ArrayCollection id="arrColl"
                source="[One,Two,Three,Four,Five]" />

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="requiresSelection:">
                <FxCheckBox id="checkBox"
                        selected="true" />
            <FormItem label="selectedIndex:">
                <Label text="{btnBar.selectedIndex}" />
            <FormItem label="selectedItem:">
                <Label text="{ObjectUtil.toString(btnBar.selectedItem)}" />

    <FxButtonBar id="btnBar"
            requiresSelection="{checkBox.selected}" />


This entry is based on a beta version of the Flex Gumbo 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 Gumbo SDK.