Spark ComboBox/TextArea focus interaction

Question

I have a ComboBox set up to change the font size of the text in a TextArea.  If I set the ComboBox to return focus to the TextArea in its change event, it causes the ComboBox to require 2 clicks to make a selection.  Here's a simple application showing the behaviour that I'm seeeing:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                  xmlns:s="library://ns.adobe.com/flex/spark"
                  xmlns:mx="library://ns.adobe.com/flex/mx">
     <fx:Script>     <![CDATA[
               import flashx.textLayout.edit.IEditManager;
               import flashx.textLayout.formats.TextLayoutFormat;
               protected function sizeChange():void {
                    var format:TextLayoutFormat = new TextLayoutFormat();
                    format.fontSize = comboBox.selectedItem;
                    IEditManager(textArea.textFlow.interactionManager).applyLeafFormat(format);
                    textArea.setFocus();  //Without this line, the combobox works as expected.  With it, you must click on your selection twice to close the combobox
     ]]>     </fx:Script>
     <s:VGroup>
          <s:TextArea id="textArea" />
          <s:ComboBox id="comboBox" change="sizeChange()">
               <s:dataProvider>
                    <s:ArrayList>
                         <fx:int>10</fx:int>
                         <fx:int>12</fx:int>
                         <fx:int>14</fx:int>
                         <fx:int>16</fx:int>
                         <fx:int>24</fx:int>
                         <fx:int>32</fx:int>
                    </s:ArrayList>
               </s:dataProvider>
          </s:ComboBox>
     </s:VGroup>
</s:Application>

Answer 1

Looks like an editor interaction.  I wouldn't want the ComboBox to ever get
focus so I'd skip the setFocus call and just set tabFocusEnabled=false and
mouseFocusEnabled = false;