ConvFit.cpp

    if ( ! item )
      return;

    // is it a fit property ?
    QtProperty* prop = item->property();

    if ( prop == m_cfProp["StartX"] || prop == m_cfProp["EndX"] )
      return;

    // is it already fixed?
    bool fixed = prop->propertyManager() != m_cfDblMng;

    if ( fixed && prop->propertyManager() != m_stringManager ) 
      return;

    // Create the menu
    QMenu* menu = new QMenu("ConvFit", m_cfTree);
    QAction* action;

    if ( ! fixed )
    {
      action = new QAction("Fix", this);
      connect(action, SIGNAL(triggered()), this, SLOT(fixItem()));
    }
    else
    {
      action = new QAction("Remove Fix", this);
      connect(action, SIGNAL(triggered()), this, SLOT(unFixItem()));
    }

    menu->addAction(action);

    // Show the menu
    menu->popup(QCursor::pos());
  }

  void ConvFit::fixItem()
  {
    QtBrowserItem* item = m_cfTree->currentItem();

    // Determine what the property is.
    QtProperty* prop = item->property();
		QtProperty* fixedProp = m_stringManager->addProperty( prop->propertyName() );
    QtProperty* fprlbl = m_stringManager->addProperty("Fixed");
    fixedProp->addSubProperty(fprlbl);
    m_stringManager->setValue(fixedProp, prop->valueText());

    item->parent()->property()->addSubProperty(fixedProp);

    m_fixedProps[fixedProp] = prop;

    item->parent()->property()->removeSubProperty(prop);
  }

  void ConvFit::unFixItem()
  {
    QtBrowserItem* item = m_cfTree->currentItem();

    QtProperty* prop = item->property();
    if ( prop->subProperties().empty() )
    { 
      item = item->parent();
      prop = item->property();
    }

    item->parent()->property()->addSubProperty(m_fixedProps[prop]);
    item->parent()->property()->removeSubProperty(prop);
    m_fixedProps.remove(prop);
    QtProperty* proplbl = prop->subProperties()[0];
    delete proplbl;
    delete prop;
  }

  void ConvFit::showTieCheckbox(QString fitType)
  {
      uiForm().confit_ckTieCentres->setVisible( fitType == "Two Lorentzians" );
  }

} // namespace IDA
} // namespace CustomInterfaces
} // namespace MantidQt