Flex4: Combo Box with CheckBox Inside

Apologies for all the simple questions but they are born of my sudden and unplanned migration from flex 3 to flex 4.

Ok I have a combo box which I would like to show a list of selectable check boxes.

<s:ComboBox   x="181" y="-7" width="233" id="dropISLIST" itemRenderer="IsListFilterCheckBox" dataProvider="{GetIsList.lastResult.ReportFilterList.ReportFilter}" color="#000000"/>

To this end I have built the foll开发者_如何学编程owing item renderer.

<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" 
                xmlns:s="library://ns.adobe.com/flex/spark" 
                xmlns:mx="library://ns.adobe.com/flex/mx" 
                autoDrawBackground="true" width="142" height="22">
    <s:CheckBox x="0" y="2" label="{data}" color="#000000"/>

</s:ItemRenderer>

Now that all works fine, how ever, I can not "Check" a box, what I would like to be able to do is have the user be able to select a number of check boxes. And then also figure out what they have checked.

Any help in this regard would be greatly apreciated thank you so much in advance.

Regards Craig

Try this component. It should do everything you are needing http://www.carballares.es/en/arcadio/?page_id=352