Stuff
public text v1 · immutable textBuffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (lookup_widget (GTK_WIDGET (button), "textviewXMLInformation")));
gtk_text_buffer_get_start_iter (textBuffer, textIter);
gtk_text_buffer_insert (textBuffer, textIter, " Documento XML generado con éxito.", -1);