/// <summary>
    /// Sets up the Property Definition tree.
    /// </summary>
    protected void SetUpPropertyDefinitionTree()
    {
        propertyListCtl = new PropertyListControl(tvPropertyDefinitions);

        DomainDAO dao = DomainFactory.GetDAO("PropertyDefinition");
        List<Domain> properties = dao.Get();
        propertyListCtl.Populate(properties);
    }