How to change the SWF i have loaded in Flex during runtime

Guys

I have a Flex application in which i have a SWF loader which loads a swf from an external Actionscript project.

I want that SWF file (from External AS project) to be modified when the user does some operation on the main Flex Application… I mean i have to create some other objects on that SWF file.

Please help guys…
thanx in advance…