Developer Product GUI making (Help?) *Edited*

Hi there! I am attempting to take advantage of the Developer Products on Roblox. I understand how to make a brick (surface GUI) that when you click it it gives you the product (Tip Jar for example) but I would like to transfer that to a GUI that you can open/close like a shop GUI so that everyone can see the Dev Products and not have to walk up to something to buy it. Sorry for the run-on sentence. Any help would be great. Thanks!

**Edit: To sum this up... is the code for the GUI basically the same as the one for the surface GUI that you have to click?

P.S. I know how to make a GUI and everything and I can figure out how to make an open/close button but the Dev Product scripting has gotten the better of me.