Issue with Spark DropDownList in 15.0

[Jason Taylor]

noticing the following issue:

- spark drop down list has a event handler for change
- on change event handler calls spark TextArea.setfocus (guessing any setfocus 
should trigger issue)
- dropdownlist does not close


Sample Application:
<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"; 
xmlns:s="library://ns.adobe.com/flex/spark">
    <s:DropDownList id="fontDDL" width="150" change="OnFontChange(event)">
        <s:dataProvider>
            <s:ArrayList id="fontList" source="[Arial,Times New 
Roman,Verdana,Trebuchet MS]" />
        </s:dataProvider>
    </s:DropDownList>

    <s:TextArea id="textArea" width="100%" top="20" bottom="10"/>
    <fx:Script><![CDATA[
        import spark.events.IndexChangeEvent;

        protected function OnFontChange(evt:IndexChangeEvent):void
        {
            textArea.setFocus();
        }
        ]]></fx:Script>
</s:Application>