void gtk_tool_button_set_icon_widget ( GtkToolButton* button, GtkWidget* icon_widget )
icon as the widget used as icon on
NULL the icon is determined by the
GtkToolButton:stock-id property. If the
GtkToolButton:stock-id property is also
button will not have an icon.
Available since: 2.4
The widget used as icon, or
The argument can be
The data is owned by the caller of the method.