gtk/gtk.go
func (v *Toolbar) SetIconSize(iconSize IconSize) {
	C.gtk_toolbar_set_icon_size(v.native(), C.GtkIconSize(iconSize))
}
func (v *Toolbar) SetIconSize(iconSize IconSize) {
	C.gtk_toolbar_set_icon_size(v.native(), C.GtkIconSize(iconSize))
}
// SetIconSize is a wrapper around gtk_toolbar_set_icon_size().