If you want a tool button that can be toggled on and off, you may use
Gtk::RadioButton with
some special properties set.
See the comments in the following code fragment:
Gtk::RadioButtonGroup group;
Gtk::RadioButton *button = new Gtk::RadioButton();
button->set_group(group);
Glib::FileTest file_test = Glib::FILE_TEST_EXISTS;
if (Glib::file_test("cursor-ellipse.xpm", file_test))
button->add_pixlabel(pixfile, ""); //no text label
button->set_active(true);
button->set_mode(false); //draw_indicator = false
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