drag and drop of swc components

We need a capability by which we can drag and drop swc components in our Flex Application.

Any ideas would help.

Thanks

SWC is ZIP archive. You can unpack it with any ZIP library, inside you'll find catalog.xml, where library classes are listed (script.@name), and library.swf. You can load it with Loader.loadBytes after extraction in your ApplicationDomain. Knowing class names, you can get classes with getDefinitionByName.
Just curious - what your application is going to do with unknown classes in runtime?