You need to Import a file called CommandFunc.txt into your map. Then change it's path to: Units\CommandFunc.txt
I attached the file below and edited it to hide Move, Stop, and Hold Position.
You can open this file in Notepad (it's just a text document) and edit it yourself to customize what you want to hide/move.
To hide a button all you have to do is change it's X,Y positions to 0,-11 (Same is true for Abilities in the Object Editor). As you can see I have done this already for Move, Stop, and Hold Position. You can also use this to reposition the buttons.