Create UI Items Dynamically and Call them

There are threads similar but not quite what I am looking for.
I want to be able to create buttons dynamically during run time when the user clicks the "New" button inside the menu.
I then need a way to dynamically name these buttons so i can call them for individual actions.
Any code or tips would be helpful. I know in c++ i would just create an integer counter and use that to name new items using string conversion but i dont think i can do that here.