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Hi, the app for remote control of devices work for my tv, bluray, etc but doesn´t with my directv hd box, the configuration process is pretty clear and appear one for directv but this doesn't work. 
thanks for your time and response.
It's hard for me to verify this as i don't have that box.
I recommend that you first update your tablet if you haven't done so using PC Companion: http://www.sonymobile.com/global-en/software/tablets/xperia-tablet-z/.
If updating doesn't help, try learning your tablet the commands using the manual mode and the standard remote to see if there might be a problem with the preset or model.