Creates a new GtkToolButton using icon_widget as contents and label as label. Since 2.4
a string that will be used as label, or NULL. [allow-none]
a widget that will be used as the button contents, or NULL. [allow-none]
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new GtkToolButton using icon_widget as contents and label as label. Since 2.4