/// <summary>
        /// Adds a new load case.
        /// If the name is not unique, the existing load case will be returned.
        /// </summary>
        /// <param name="app">The application.</param>
        /// <param name="analyzer">The analyzer.</param>
        /// <param name="loadCases">The load cases.</param>
        /// <param name="uniqueName">The unique name.</param>
        /// <returns>StaticLinear.</returns>
        /// <exception cref="T:MPT.CSI.API.Core.Support.CSiException">API_DEFAULT_ERROR_CODE</exception>
        internal static StaticNonlinearStaged Add(
            ApiCSiApplication app,
            Analyzer analyzer,
            LoadCases loadCases,
            string uniqueName)
        {
            ApiStaticNonlinearStaged apiStaticNonlinearStaged = getApiLoadCase(app).StaticNonlinearStaged;

            apiStaticNonlinearStaged?.SetCase(uniqueName);
            return(Factory(app, analyzer, loadCases, uniqueName));
        }