使用Actionscript 3在没有页面刷新的情况下更新ASP.NET iFrame

I would like to have a FLEX SWF Menu in .NET that is animated, and use button clicks to update an iFrame in an .NET 2.0 Ajax enabled application without a page update or refresh. If I use URLVaribles in Flex, The only way I've gotten to them to ASP.NET is via URL Page Navigation which always refreshes the screen. There is a LOADVARS function but I have not gotten it to work. Is there any suggestion on how one would do this??I would like to have a FLEX SWF Menu in .NET th