Help with yad

Hi
I am new with yad and i need help :)
I have this script:

#!/bin/bash
cmd=(
yad
--button="Office":libreoffice
--button="Text editor":geany
--button="Printer":'firefox "localhost:631"'
--button="File manager" : pcmanfm
--button="Terminal":xterm
--button="Videos":smplayer
)
"${cmd[@]}"

1) The line "Printer" not work. I think could be the colon, but i dont know how to make this work as expected

2) Buttons are show in horizontal line one to right to the previous. I wish to display one under another. It is possible?

Thanks in advance