Replace them with grouped toggle buttons.
<class name="linked"/>
</style>
<child>
- <object class="GtkRadioButton" id="normal_radio">
+ <object class="GtkToggleButton" id="normal_radio">
<property name="label" translatable="yes">Normal</property>
+ <property name="active">1</property>
</object>
</child>
<child>
- <object class="GtkRadioButton" id="symbolic_radio">
+ <object class="GtkToggleButton" id="symbolic_radio">
<property name="label" translatable="yes">Symbolic</property>
<property name="group">normal_radio</property>
<signal name="notify::active" handler="symbolic_toggled" swapped="yes" after="yes"/>