flex spark datagrid tab focus on a custom GridItemRenderer

Columna:

rendererIsEditable="true"

DataGrid:

hasFocusableChildren="true"


Ejemplo MXML:

<s:DataGrid id="datagrid" hasFocusableChildren="true">
<s:columns>
<s:ArrayList>
<s:GridColumn id="c" dataField="value" headerText="Value" itemRenderer="itemRender" rendererIsEditable="true"/>

</s:ArrayList>
</s:columns>
</s:DataGrid>


ItemRender:

<?xml version="1.0" encoding="utf-8"?>
<s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
clipAndEnableScrolling="true" creationComplete="creationCompleteHandler(event)">

<s:ComboBox id="comboBox" width="100%" height="100%" change="changeHandler(event)" dataProvider="{array}" labelField="value"
selectedIndex="-1" prompt="Seleccione" styleName="myCustomStyleCombobox"/>
</s:GridItemRenderer>