<?xml version="1.0" encoding="utf-8"?>
<mx:Application name="Image_doubleClick_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
        	import mx.controls.Alert;

            private function img_doubleClick(evt:MouseEvent):void {
               Alert.show('double click event');
            }
            private function img_singleClick(evt:MouseEvent):void {
               Alert.show('single click event');
            }
        ]]>
    </mx:Script>

    <mx:Image id="img1"
            source="colorpicker.JPG"
            doubleClickEnabled="true"
            doubleClick="img_doubleClick(event);" />

    <mx:Image id="img2"
            source="colorpickerwheel.JPG"
            click="img_singleClick(event)" />

</mx:Application>