unbind_box.pack_start (*hint, false, true);
unbind_box.pack_start (unbind_button, false, false);
unbind_button.signal_clicked().connect (sigc::mem_fun (*this, &KeyEditor::unbind));
unbind_box.pack_start (*hint, false, true);
unbind_box.pack_start (unbind_button, false, false);
unbind_button.signal_clicked().connect (sigc::mem_fun (*this, &KeyEditor::unbind));