How to force Scroller scrollbars to overlap content in Flex 4.0

I have the following spark Scroller

<s:VGroup width="100%" height="100%开发者_StackOverflow" gap="0">
    <s:Scroller width="100%" height="100%">
        <s:DataGroup width="100%" height="100%" itemRenderer="components.grid.GridItemRenderer">
            <s:layout>
                <s:VerticalLayout gap="0" />
            </s:layout>
        </s:DataGroup>
    </s:Scroller>
</s:VGroup>

which is set to 100% width. The DataGroup is also set to 100% width. What I want to achieve is for the scroller's vertical scrollbar to OVERLAP the DataGrid. In other words I want the DataGroup to maintain the width of the outer VGroup even when the vertical scrollbar is displayed. I don't need the vertical scrollbar to move my content to the left, i want it to be displayed in top of that. Anybody has any idea?

Hope to have made myself clear enough, thanks to everyone!

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Well, after much struggling I ended up changing my mxml markup so I could achieve what I was looking for. Instead of trying to overlap the scroller's scrollbar over the scroller's content, I droped the scroller completely and wraped my content within a group. Added a s:VScrollBar with a viewport pointing to the forementioned group and positioned this scrollbar over the group's content.

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Does setting Scroller.measuredSizeIncludesScrollBars to true achieve what you are looking for?