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In the .etk file:widget{   type: "button";   name: "custom-signal-button";   parent: "button-window-button-frame";   label: "custom signal";   signal   {      name: "clicked";      emit: "custom_signal_emittion";   }}In the .c file:void _custom_signal_emittion_cb(void *data){   printf("This is a custom emittion!\n");}......evolve_signal_connect(evolve, "custom_signal_emittion", _custom_signal_emittion_cb, NULL);