gtkToolButtonSetIconWidget: gtkToolButtonSetIconWidget
Description
Sets icon as the widget used as icon on button. If icon.widget is
NULL the icon is determined by the "stock_id" property. If the
"stock_id" property is also NULL, button will not have an icon.Usage
gtkToolButtonSetIconWidget(object, icon.widget = NULL)
Arguments
icon.widget
the widget used as icon, or NULL. [ allow-none ]