<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/31/displaying-different-fonts-in-a-dropdown-menu-on-a-combobox-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:ArrayCollection id="arrColl"
            source="{Font.enumerateFonts(true)}">
        <mx:sort>
            <mx:Sort>
                <mx:fields>
                    <mx:SortField name="fontName" />
                </mx:fields>
            </mx:Sort>
        </mx:sort>
    </mx:ArrayCollection>

    <mx:ComboBox id="comboBox"
            dataProvider="{arrColl}"
            labelField="fontName"
            fontSize="14"
            open="comboBox.dropdown.variableRowHeight = true;">
        <mx:itemRenderer>
            <mx:Component>
                <mx:Label fontFamily="{data.fontName}"
                        toolTip="{data.fontName}" />
            </mx:Component>
        </mx:itemRenderer>
    </mx:ComboBox>

</mx:Application>