Enable a Group by checking a DropDownList selection

         
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
    xmlns:s="library://ns.adobe.com/flex/spark"
    creationComplete="handleCreationComplete();">
    <mx:Script>
        
            import mx.collections.ArrayCollection;
            import spark.core.MaskType;
            
            [Bindable] public var masks:ArrayCollection;
            private function handleCreationComplete():void
            {
                masks = new ArrayCollection( [ MaskType.CLIP,MaskType.ALPHA,MaskType.LUMINOSITY ] );
                maskList.selectedIndex = 0;
            }
      
    </mx:Script>
    <s:DropDownList id="maskList" dataProvider="{masks}" />

    <s:Group enabled="{maskList.selectedItem==MaskType.LUMINOSITY}">
        <s:layout>
            <s:HorizontalLayout />
        </s:layout>
        <mx:CheckBox label="A" />
        <mx:CheckBox label="B" />
    </s:Group>
    
</mx:Application>

Related examples in the same category

1.	Fill ArrayCollection to a DropDownList
2.	Get current selected value from DropDownList
3.	Trigger the drop down of DropDownList
4.	DropDownList control with prompt message

Enable a Group by checking a DropDownList selection : DropDownList « Components « Flex

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