Genetic Algorithm - Plotting fitness values

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I'm running a genetic algorithm in Matlab with [x,fval]=ga(gaproblem)
This all works fine and I get nice results. Now I wish to plot the best fitness function value at each generation; according to the user manual it should be as simple as setting
This however produces no result, I get no figure. As far as I understand @gaplotbestf is built in, and there should be no need to define it, or am I getting it wrong?
It would be nice if someone could help.

Accepted Answer

Seth DeLand
Seth DeLand on 11 Mar 2013
PlotFcns needs to be passed in as an option for ga:
problem.options.PlotFcns = @gaplotbestf;

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