void ConfigureTimelinePopup::onChangeType()
{
  if (m_lockUpdates)
    return;

  IDocumentSettings* docSet = docSettings();
  if (docSet)
    docSet->setOnionskinType(m_merge->isSelected() ?
      IDocumentSettings::Onionskin_Merge:
      IDocumentSettings::Onionskin_RedBlueTint);
}