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.
Return: a new radio button.
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.