Possible to load swatch from file?

Hi,

  I'm trying to simply create a rectangle and then fill it with a pattern that the user can specify but which is also loaded by the plug-in.  I'm pretty sure I can make the box and fill it easily enough with the AIActionManagerSuite. 

I just have no idea how to get a custom pattern from a file into a swatch programmatically.  Any ideas?

Thanks,

Bill