Is it possible to specify individual fonts in Flex DropDownList?

I have just implemented a dropdownlist of checkboxes taken from this ComboCheck example but made it extend DropDownList instead of ComboBox to provide better functionality that I required. I am attempting to create a DropDownList where some items are bold and non-checkboxes (or can be checkboxes) and others are not.

I have not been able to find anything online about doing this yet and have been trying to figure it out. I am currently using an ArrayCollection as a dataProvider but I think this could possibly be my issue and I should be trying to setup the labels in flex not AS3.

Does anyone know if this is possible? And if so do they have any links that could possibly help point me in the right direction?

Thanks.

EDIT: Code added for the itemRenderer, this worked I just need to specify each item that I want to be bold, though is there a better way to do this in the flex code as opposed to checking for a matching string in the renderer?

public class ComboCheckItemRenderer extends ItemRenderer{  
    public var item:CheckBox;  

    public function ComboCheckItemRenderer(){
        super();
        item = new CheckBox();
        item.x = 5;
        addElement(item);
        item.addEventListener(MouseEvent.CLICK, onClick);
    }

    private var _data:Object;
    [Bindable]override public function set data (value:Object):void {
        if (value!=null) {
            _data = value;
            item.label = value.label;
            if(item.label == "item1"){
                item.setStyle("color","0x00ff00");
                item.setStyle("fontWeight","bold");
            }
            item.selected = value.selected;
        }
    }

[ ]**GROUP**  
   [ ] element
   [ ] element
[ ]**GROUP**  
   [ ] element

What does your data look like? Why aren't you using MXML for this? Why are you overriding set data() as opposed to hooking the dataChange event? You are writing way more code than you need to here.

Lets look at it in a more "Flexy" way. Notice how I am using data binding for everything and conditionally setting the fontWeight based on the data that comes in. Anything more complicated should bust out to a function in the Script tag.

<?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">

    <fx:Script>
        <![CDATA[
            protected function onClick(event:MouseEvent):void {
            }
        ]]>
    </fx:Script>

    <s:CheckBox x="5" click="onClick(event)" 
                label="{data.label}" selected="@{data.selected}" 
                fontWeight="{data.label == 'item1' ? 'bold' : 'normal'}"/>


</s:ItemRenderer>

In light of your question you added in your edit, I would ask: What criteria are you using? You can put any function in your binding expression, so at a very minimum, you might do something like this:

    <fx:Script>
    <![CDATA[
        private var itemsToBold:Array = ["label1", "label2"];

        private function getFontWeight(label):String {
            if(itemsToBold.indexOf(label) > 0)
                return "bold";

            return "normal";
        }

    ]]>
</fx:Script>

<s:CheckBox fontWeight="{getFontWeight(data.label)}"/>