In the starcraft 2 map editor these are called dialogs (the background for menus) and dialog items which you attach to dialogs (which include buttons, images, text boxes etcetc).
Happy googling -> http://lmgtfy.com/?q=starcraft+2+galaxy+editor+dialog+tutorial
:)

KillerJoe1273 Regular ShmoeHello, My name is Joe and I am very new to the map editor and have a question with the triggers for my map.
I am making a TD/Survival map but i cannot figure out how to make an option box. I want to make a box that pops up with two[2] clickable options. option 1 would run trigger 1 for the TD and option 2 would run trigger 1 for the survival part of the map. I know it is possible and probably very easy i am just missing it and any help would be awesome. I am taking a class in college where this map is part of my final project (we got to pick which game we could make a custom in).