Applying styles at run time to your flex application.here there are two things to consider
1.defining ur styles in a .css file.
Here u have to define ur styles in a .css file for various controls or anything according to ur need. include them in the same folder.
———} any style definition
2.compile them to generate .swf files.
using adobe flex builder commond prompt compile ur .css file.i.e first copy the .css files to flex builder folder and then at cmd prompt use the command
it generates ur .swf file at the flex builder folder (c:prog file/flex –/style1.swf) now take the generated .swf file to ur flex project folder/bin/ paste it.
now the required .swf files are ready.