[flexcoders] HOw to disable to modifie the selection of an CheckBox

[Nini7016 Nini7016]

Hello 

I have a CheckBox   and i would like that it will usually selected event when 
user click in the check box it will not be deselected ???

<mx:itemRenderer>
                        <mx:Component>
                            <mx:CheckBox   selected="true" color="blue"  
enabled="false"/>
                        </mx:Component>
</mx:itemRenderer>

which attributes can i add it to do that PLEASE ?

Thank you