gtkLabelSetMarkupWithMnemonic,
gtkLabelSetTextWithMnemonic, gtkLabelNewWithMnemonic
or the "use_underline" property) the label can be associated with a
widget that is the target of the mnemonic. When the label is inside
a widget (like a GtkButton or a GtkNotebook tab) it is
automatically associated with the correct widget, but sometimes
(i.e. when the target is a GtkEntry next to the label) you need to
set it explicitly using this function.gtkLabelSetMnemonicWidget(object, widget)objectGtkLabelwidgetGtkWidget. [ allow-none ]