Welcome to YorkieTalk ilovemybear! Potty training just takes time and patience. Some have used bins, some have used some litter boxes, some train their Yorkies to ring a bell when they need to go, here's some good threads to read, hope it helps!
http://www.yorkietalk.com/forums/sho...potty+training http://www.yorkietalk.com/forums/sho...potty+training http://www.yorkietalk.com/forums/sho...potty+training