Using Multi-Zone Support on Newer USB-UIRT's

[domotiqa]

Hello I'm able to send IR code through mcontrol as explained here:
http://www.embeddedautomation.com/forum ... php?t=1097

however when I want to use the zone function (putting Z1 Z2 or Z3 before the code) it's not working at all ! Signal is not send anymore to the usb-uirt emiter! Do you have a trick to add the code to the "pronto"(i guess) format ??
I try to change the length and add Z3.. to the 4th word without success!
please help !!!!