[flexcoders] Invisible elements taking up space

[whatabrain]

When I hide an object using the "visibility" attribute, it still takes 
up space in the document. I know that in css, you can use the "display" 
style to fix this. How do you do it in flex?

<mx:VBox>
        <mx:HBox>
                <mx:Text text="hi"/>
        </mx:HBox>
        <mx:HBox visible="false"> <!-- This takes up space -->
                <mx:Text text="hi"/>
        </mx:HBox>
        <mx:HBox>
                <mx:Text text="hi"/>
        </mx:HBox>
</mx:VBox>