Radio button

[tiproast earthlink net]

My application has a number of radio buttons stored in a horizontal button box.

The radio buttons were created with gtk_radio_button_new_with_label and 
gtk_radio_button_new_with_label_from_widget.

Each button and its label is left-justified (aligned?) within its allocation rectangle.

I want the button and the label to be centered in the allocation rectangle.

The machines on which my application will be deployed are running Gtk version 2.0.

Thanks in advance for any help.