How to mask a figure in Simulink

I am study an example provided in Simulink "Performance of Three PSS for Interarea Oscillations"
I found in this example when you click on the subsystem" Show bode plot" you can directly get the figure.
I am wondering how to do this, i.e, mask a figure into a subsystem?
Thank you!!

Asked:

on 1 Sep 2013

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