/// <summary>
        /// Handles the SaveClick event of the dlgChannelAttributes control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        protected void dlgChannelAttributes_SaveClick(object sender, EventArgs e)
        {
            Rock.Model.Attribute attribute = new Rock.Model.Attribute();
            edtChannelAttributes.GetAttributeProperties(attribute);

            // Controls will show warnings
            if (!attribute.IsValid)
            {
                return;
            }

            if (ChannelAttributesState.Any(a => a.Guid.Equals(attribute.Guid)))
            {
                attribute.Order = ChannelAttributesState.Where(a => a.Guid.Equals(attribute.Guid)).FirstOrDefault().Order;
                ChannelAttributesState.RemoveEntity(attribute.Guid);
            }
            else
            {
                attribute.Order = ChannelAttributesState.Any() ? ChannelAttributesState.Max(a => a.Order) + 1 : 0;
            }
            ChannelAttributesState.Add(attribute);

            BindChannelAttributesGrid();

            HideDialog();
        }
        /// <summary>
        /// Handles the Delete event of the gChannelAttributes control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RowEventArgs" /> instance containing the event data.</param>
        /// <exception cref="System.NotImplementedException"></exception>
        protected void gChannelAttributes_Delete(object sender, RowEventArgs e)
        {
            Guid attributeGuid = (Guid)e.RowKeyValue;

            ChannelAttributesState.RemoveEntity(attributeGuid);

            BindChannelAttributesGrid();
        }