broadinstitute/IGV — pull request #70 by adf-ncgr (2013-11-16 03:42:18+00:00)
Title: added internal sorting of VariantTrack by sample attributes when track sorting by attribute is applied.

as per the suggestion I made earlier today via the list:
https://groups.google.com/forum/#!topic/igv-help/9dhDByk7Dac

thanks for considering it...