<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:comps="comps.*" >
    <mx:Script>
        <![CDATA[
            import mx.managers.*;

            [Bindable]
            private var myDP:Array = [
                {label: "New"},
                {label: "Open"},
                {type: "separator"},
                {label: "Help" },
                {label: "Run"},
                {type: "separator"},
                {label: "Exit" }
            ];
        ]]>
    </mx:Script>

    <mx:Style>
	MyComboBoxList {
	        separatorSkin: Embed(source="purpleLine.gif");
	    }
    </mx:Style>

    <mx:ComboBox dropdownFactory="comps.MyComboBoxList" itemRenderer="comps.MyComboBoxItemRenderer" dataProvider="{myDP}"
    	rowCount="{myDP.length}"/>

</mx:Application>