Impossiable, Just use a program like Jass Shop Pro and open the map, all the GUI as JASS code is there no matter what.
Vexorian's optimizer (available from WC3C or the DL section) can hide both GUI and JASS triggers from normal WE, but this also means you can not edit them since you can not "un hide" them once hidden. Iit is also eithor all or nothing since you can not hide specific triggers but have to hide all of them.