func (v *TreeViewColumn) AddAttribute(renderer ICellRenderer, attribute string, column int) {
	cstr := C.CString(attribute)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_tree_view_column_add_attribute(v.native(),
		renderer.toCellRenderer(), (*C.gchar)(cstr), C.gint(column))
}
func (v *TreeViewColumn) AddAttribute(renderer ICellRenderer, attribute string, column int) {
	cstr := C.CString(attribute)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_tree_view_column_add_attribute(v.native(),
		renderer.toCellRenderer(), (*C.gchar)(cstr), C.gint(column))
}
// AddAttribute() is a wrapper around gtk_tree_view_column_add_attribute().