gtk:radio-button-new-with-mnemonic (group label)

group -- the gtk:radio-button group
label -- a string with the text of the button, with an underscore in front of the mnemonic character

The new gtk:radio-button widget.

Creates a new radio button containing a label, adding it to the same group as group. The label will be created using the gtk:label-new-with-mnemonic function, so underscores in label indicate the mnemonic for the button.