doesn't work for me i just tried it.. there is a way to still do this though it is time consuming, when you create a program, select instrument... you can then layer samples that way. however if you plan on tweaking out drums, you have to change the note range for every sample which is a pain in the ass but at least its still there.. hope this helps.
It's working here,when you press mode+pad 11 + cursor to pad assignment(EG:A06,A07) make sure you hit WINDOW,Now choose which other samples you wish to layer.
Interface : SSL Bus +/SSL Fusion/Silver Bullet MK1/Presonus 32S/Orion Studio Textures : Mpc X/Kurzweil K2700/Korg Prologue 16/Sequential Take 5/Deepmind 12D Pedals : Strymon Big Sky+Timeline.Eventide H90