How can I create a plot during an Optimization using Output Function?

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I tried plot some Points of my Optimization (I used gamultiobj) using an Output Function. But all Figures appear only when the optimization has finished or I quit the Programm using "ctrl +c".

I use the following OutputFcn:

function [st, opt,optchange] = gamOutput( optionsin,statein,flag)
disp(statein.Score)
disp(statein.Population)
figure
plot(statein.Score(:,1),statein.Population(:,1))
st = statein;
opt = [];
optchange = 0;
end

I know that the function is called because the score and the population are diplayed in the command Window during the Optimization. I just don't know, why the figures are all created at the end of the Optimization.