protected:
virtual void button_toggled(Gtk::ToggleButton* button, uint8_t button_nr) = 0;
Gtk::Label _button_labels[4][4];
Gtk::ToggleButton _buttons[4][4];
int _recursion_counter;
protected:
virtual void button_toggled(Gtk::ToggleButton* button, uint8_t button_nr) = 0;
Gtk::Label _button_labels[4][4];
Gtk::ToggleButton _buttons[4][4];
int _recursion_counter;