Show/hide checkbox in grid

[mark goldin]

I have the following datagrid:
<mx:DataGridColumn dataField="visible2"
headerText=""
textAlign="center"
width="35">
<mx:itemRenderer>
<mx:Component>
<mx:CheckBox visible="{data.headerText2 != ''}" />
</mx:Component>
</mx:itemRenderer>
</mx:DataGridColumn>
<mx:DataGridColumn headerText="Name"
dataField="headerText2" />

The problem is it does not hide the checkbox when data.headerText2 is
empty. But if I set enabled property to the same condition it would disable
it. Any idea how to hide the checkbox?

Thanks