Personally, I just explode and regroup anything that I need to un-dynamicise, but I believe there's a script hanging around somewhere, possibly by TIG?
edit: here it is http://sketchucation.com/forums/viewtopic.php?f=15%26amp;t=40538 , but the iterative version (that kills more than one nested component) is broken, so you might have to beg TIG for a fix