I dont think you can have more than a single line of code in a button
 What might work is to make up two buttons on your screen, one with a G0 X0 Y0 and the other G0 Z0, You could then make the Go To Z button a VB button and add code for it to call your buttons in the order you want. I think that should be possible but maybe not, will have to try it out at some point but its getting late and my brains functioning at less than 10% capacity, and  10% of very little is almost zero   so it wont be tonight.

Hood

I understand that. Good night Hood.

mmmm in the light of day maybe my suggestion wont work, will have to think about it later on.
Hood

I got it Hood,
     I downloaded the latest version of Mach. Used my old screen set. Also downloaded screen 4 to mill PC and used it to change GOTO Z button. I had set it up as Gcode yesterday. Changed it back to function, Go to zeros. Went to config., did the safe Z setup. All is well in the universe.


Brett