gtk-label-set-text-with-mnemonic (label text)

label -- a gtk-label widget
text -- a string for the label

Sets the text of the label from the string text. If characters in text are preceded by an underscore, they are underlined indicating that they represent a keyboard accelerator called a mnemonic. The mnemonic key can be used to activate another widget, chosen automatically, or explicitly using the gtk-label-mnemonic-widget function.