New ui system multitouch problem

Hello guys, I am working on a mobile android game.And using the new ui system but I got a problem with that.Multitouch couldnt working.While I pressing a button during pressed another one,it doesnt work.I searched before I open that topic.I found adding a Event trigger component in my button.(and sure I deleted stock button script,so I tried witout delete,it didnt work too).I am moving my player with buttons,anyway I added pointerdown for start moving(a bool will true) and pointerup for stop moving in that direction.(bool =false).But when I did same thing for other directions buttons;multitouch wont working:/