sortable("refresh") doesn't refresh list of elements matching connectWith selector

I'm building a widget that has 2 levels of sortables that lets a user

build a form. There are fieldsets and fields, and I'm trying to make

it so that you can sort the fieldsets and also sort the fields both

within the fieldset, and also moving between fieldsets (they're linked

using the connectWith option).

That's all built and working now, my issue is that I want to be able

to dynamically add new fieldsets (which is easy), but when I add a new

fieldset and do a .sortable('refresh'); on both sortables, it won't

allow me to move fields into the new fieldset. It seems to me that the

refresh command doesn't refresh the array of elements matching the

connectWith selector, and thus I can't move fields into the new fieldset because jQuery doesn't realize it should be connected to the sortable.