How can I develop a graph through the use of a slider going through a for loop?

Everytime the loop is executed in my code, it builds one part of a final graph. After one loop is executed it goes ahead and plots one part of the graph. I want to be able to control every step of the develop of the graph with a slider in GUIDE. I tried to use a toogle button(with a while statement), but it crashes everything. What are some advices?

I tried to use a slider but it gets very complicated. I can´t get the value of the slider in another function.