ConfirmDialog focus button when it opens

[v1d3rm3]

I'm submitting a ... (check one with "x")

[ ] bug report => Search github for a similar issue or PR before submitting
[x] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Current behavior
p-confirmDialog is not focusing in buttons when it opens.

Expected behavior
I think it'll be good if when it opens, the focus goes to the first button of the ConfirmDialog

[cagataycivici]

Agreed!