[flexcoders] css in flex 4

[Aicha ..]

i everybody
I have my

<mx:Button label="test" width="140" styleName="rightAlignDataGridCol"
mouseEnabled="false" top="0" x="23" fillAlphas="[1.0, 1.0, 1.0, 1.0]" />

I want to migration to flex 4 so for

<s:Button label="test" width="140" styleName="rightAlignDataGridCol"
mouseEnabled="false" top="0" x="23" fillAlphas="[1.0, 1.0, 1.0, 1.0]" />