Textvariable display in label (GUI design)

[Jah_Alarm]

hi,

pls help me out with the following issue: I wrote a function that uses
a for loop that changes a value of a certain variable each iteration.
What I want is by clicking a button in GUI (with the command bound to
this function) this value each iteration is displayed in a textbox
(label). So far only one (starting value) is displayed.

thanks,

Alex