Css file edit and update ,Flex3 Air

Question

Hi, i need to read css and access individual styles and its properties,and i need to update the css file . at present i can laod css by URLLoader and get all styles using the StyleSheet.styleNames; but its get only stylename but i need to get all the properties ,

so that i can update the style and save as css file, If you have any links regarding reading and updating css file using flex air application .pls forward to me.

Thanks in advance