UEFI Win8PE don't boot from GPT harddisk

[allgames71]

I've made a UEFI Win8PE by WADK , then burn it to a CD. I boot normal and I can see X:\Windows\System32.
I use EasyBCD to [Add New Entry] to append new boot item to existing Windows 8. The boot menu becomes like this :

Windows 8
Win8PE

But the Win8PE fail to boot with error message like insert Windows disc again ...... in the primary black and white screen.

Should I not to use EasyBCD to [Add New Entry] ? As I do the same thing in BIOs + MBR harddisk that booted perfect. In UEFI + GPT partition , do I better not to use EasyBCD , instead to use BCDEDIT , if so , what's the command line to do this with bcdedit ?

Microsoft has a tutorial here http://technet.microsoft.com/en-us/library/cc722114(v=ws.10).aspx , but it's different from what I want

Thanks