Creates a new GtkRadioButton, adding it to the same group as radio_group_member. As with gtk_radio_button_new(), a widget should be packed into the radio button.
an existing GtkRadioButton. [allow-none]
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new GtkRadioButton, adding it to the same group as radio_group_member. As with gtk_radio_button_new(), a widget should be packed into the radio button.