Amy, Yes you do can but make sure you do not attempt to use them on the same map service layer.Also you forgot to do step one of the graphic (the most important step)!
Got it and found out the problem was unzip the file, thanks Robert for your immediate help!
Amy, You get that file from the Flex API Download:It will be in the arcgis_api_for_flex_3_0\ArcGIS_Flex\skins\src\com\esri\ags\skins folder once you unzip the download.http://www.esri.com/apps/products/download/index.cfm?fuseaction=download.main&downloadid=801Don't forget to click the Mark as answer check on this post and to click the top arrow (promote).Follow the steps as shown in the below graphic:
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