Try downloading my FEX submission and running the file "cubehelix_view":
This function creates a figure containing several axes, sliders and buttons. The button labeled "Demo" will turn on and off a looped demonstration mode. You can have a look at the code to see how it works, but the basic idea is to check the button's values on each loop iteration:
% Check if the toggle button is down:
while ishghandle(tgh)&&get(tgh,'Value')
% do stuff here
end
