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label
as the label used for the tool button. The "label" property
only has an effect if not overridden by a non-NULL
"label_widget" property.
If both the "label_widget" and "label" properties are NULL
, the label
is determined by the "stock_id" property. If the "stock_id" property is also
NULL
, button
will not have a label.gtkToolButtonSetLabel(object, label = NULL)
object
label
NULL
. [ allow-none ]