Transfer function can be pilote by set_param

Hello everybody,

Do you know how to change the parameters of a transfert function or a simpowersystem component with set_param when the simulation is running.

Because I have create a Gui panel to piloted a large simulink model.

I already know how to change parameters of Gain block by using add_exec_event_listener. But I can't use it on simpowersystem block or on a Function block parameters.

Thank you