gtk/gtk.go
func (v *Toolbar) SetDropHighlightItem(toolItem IToolItem, index int) {
	C.gtk_toolbar_set_drop_highlight_item(v.native(),
		toolItem.toToolItem(), C.gint(index))
}
func (v *Toolbar) SetDropHighlightItem(toolItem IToolItem, index int) {
	C.gtk_toolbar_set_drop_highlight_item(v.native(),
		toolItem.toToolItem(), C.gint(index))
}
// SetDropHighlightItem is a wrapper around
// gtk_toolbar_set_drop_highlight_item().