click "new command"
press the "press key" button to the left of the big box.
across the top it has the cntrl, alt, tab keys, click "alt, then type the "x" key and it will do the combination.
Set your voice command and save it as usual.
All of mine are pretty normal, gear, radio tab, and so on, but Im most impressed with my "Icon" command. I fly with "normal icons" on. When I say "icon" the program will cycle thru the icon modes until it stops for a full second at "friendly icons" and then it will return to "normal icon" mode. I use it to see what the friendlies are flying around me. It helps me to "know" how they are going to fly their planes and I can react accordingly when I help them or hope to get help FROM them
Im up to 16 commands now and to help remember them I made a clipboard map with a list of them so if I forget what the voice command was for an action I can bring it up on the clipboard. I didnt need the HQ map anyway!