Expanding a checkbox automatically ?

[Euh]

I have a list that changes frequently.
I want to assign a button or a checkbox to each element from the list.
IS there a way to re-size automatically the number of choices in a
checkbox according to the number of elements ?

here is an example:

#1 button #1
#2 button #2
#3 button #3
#4 button #4

now lets say someone appends a new element (#5) to the list.
Can button #5 be generated automatically ? (or removed if someone
remove an element)