/// <summary>
        /// Called to get the properties of this type.
        /// </summary>
        /// <returns></returns>
        public PropertyDescriptorCollection GetProperties()
        {
            // Create a collection object to hold property descriptors
            PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);

            // Iterate the list of employees
            for (int i = 0; i < this.List.Count; i++)
            {
                // Create a property descriptor for the employee item and add to the property descriptor collection
                GraphMeasurementCollectionPropertyDescriptor pd = new GraphMeasurementCollectionPropertyDescriptor(this, i);
                pds.Add(pd);
            }
            // return the property descriptor collection
            return(pds);
        }
        /// <summary>
        /// Called to get the properties of this type.
        /// </summary>
        /// <returns></returns>
        public PropertyDescriptorCollection GetProperties()
        {
            // Create a collection object to hold property descriptors
            PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);

            // Iterate the list of employees
            for (int i = 0; i < this.List.Count; i++)
            {
                // Create a property descriptor for the employee item and add to the property descriptor collection
                GraphMeasurementCollectionPropertyDescriptor pd = new GraphMeasurementCollectionPropertyDescriptor(this, i);
                pds.Add(pd);
            }
            // return the property descriptor collection
            return pds;
        }