def setup_button_connectors(self):
        """Setup signal/slot mechanisms for dock buttons."""
        self.help_button.clicked.connect(self.show_help)
        self.run_button.clicked.connect(self.accept)
        self.about_button.clicked.connect(self.about)
        self.print_button.clicked.connect(self.show_print_dialog)
        self.hazard_layer_combo.currentIndexChanged.connect(
            self.index_changed_hazard_layer_combo)
        self.exposure_layer_combo.currentIndexChanged.connect(
            self.index_changed_exposure_layer_combo)
        self.aggregation_layer_combo.currentIndexChanged.connect(
            self.index_changed_aggregation_layer_combo)
Setup signal/slot mechanisms for dock buttons.