How to disable an option when i choose the same option at the other menu

Hi guys, i need help with something:

I'm working on GUIDE with a conversor program, that program convert any value inserted to any base (decimal, binary, etc)

My problem is the next:

When i choose an option in the first popupmenu the same option doesn't have to appear in the popupmenu 2.

How i can do that?

For example i put a numer, and i choose in what base it is (binary) and i wanna on the other popup menu this option doesn't show (binary).

Here i attached a pic:

[Adam Danz]

Stefany Romero asked the same question and after it was answered, the content of the question was deleted. This is the same question so I'm closing this one.

https://www.mathworks.com/matlabcentral/answers/482368-how-to-disable-an-option-when-i-choose-the-same-option-at-the-other-me