GetOrCreateSharedParamsGroup.cs

/// <summary>
        /// Get or Create Shared Parameters Group
        /// </summary>
        /// <param name="defFile"></param>
        /// <param name="grpName"></param>
        /// <returns></returns>
        public static DefinitionGroup GetOrCreateSharedParamsGroup(DefinitionFile defFile, string grpName)
        {
            try // generic
            {
                DefinitionGroup defGrp = defFile.Groups.get_Item(grpName);
                if (null == defGrp) defGrp = defFile.Groups.Create(grpName);
                return defGrp;
            }
            catch (Exception ex)
            {
                MessageBox.Show($"ERROR: Failed to get or create Shared Params Group: {ex.Message}");
                return null;
            }
        }