Box with include more items

Hello EPVP,

today i have another question^^
How can i create a box that contains one then more item AT one CLICK.
So i click on the box and receive for example 3 items.

I was able to create a box that always contains one item at one click.

But i want to know how to do it like i described^^

C++ Skills.

Well i hope i get some useful comments.

Unless you're willing to pay money I doubt anyone will give this system to you.