public partial class CssColumnLayout : CMSAbstractLayoutWebPart
    {
        private string mWebPartControlId;
        //private bool mHaveChecked;
        #region "Public properties"

        public string ColumnSplit
        {
            get
            {
                return ValidationHelper.GetString(this.GetValue("ColumnSplit"), "3-3");
            }
            set
            {
                this.SetValue("ColumnSplit", value);
            }
        }

        public string WebPartControlId
        {
            get
            {
                if (string.IsNullOrWhiteSpace(mWebPartControlId))
                {
                    this.mWebPartControlId = string.Format("{1}", this.GetValue("WebPartControlID"), this.PartInstance.InstanceGUID);
                }
                return this.mWebPartControlId;
            }
            set
            {
                this.mWebPartControlId = value;
                this.SetValue("WebPartControlID", value);
            }
        }

        #endregion "Public properties"

        #region "Methods"

        /// <summary>
        /// Prepares the layout of the web part.
        /// </summary>
        protected override void PrepareLayout()
        {
            if (this.Ancestors().Count(c => c.ID == base.ID) > 0)
            {
                this.WebPartControlId = this.PartInstance.InstanceGUID.ToString();
            }

            StartLayout();

            int[] columnWidths = GetColumnWidths(this.ColumnSplit);

            var columnId = 1;
            var columnsTot = columnWidths.Sum();
            var nestedLayout = false;

            var layoutId = this.WebPartControlId;

            Append(String.Format("<div class=\"column-layout-width-{0}\"", columnsTot));
            if (IsDesign)
            {
                Append(" id=\"", this.WebPartControlId, "_env\"");

            }
            Append(">");

            foreach (var width in columnWidths)
            {
                var columnIdent = string.Empty;
                var panelId = string.Format("{0}_{1}wpc", this.WebPartControlId, columnId);
                var zoneId = string.Format("{0}_{1}", this.ID, columnId);

                if (columnId == 1) { columnIdent = " column-item-first"; }
                if (columnId == columnWidths.Length) { columnIdent = " column-item-last"; }

                var panel = new Panel()
                {
                    CssClass = string.Format("column-item column-layout-width-{0}-{1}{2}", width, columnsTot, columnIdent),
                };

                if (IsDesign) { panel.ID = zoneId; }
                if (zoneId == this.ID) { zoneId = zoneId + "wpz"; }

                var zone = AddZone(zoneId, "Column " + columnId.ToString(), panel);

                columnId += 1;
                AddControl(panel);
            }

            Append("<div class=\"clear\"></div></div>");

            FinishLayout();
        }

        private int[] GetColumnWidths(string columnSort)
        {
            switch (columnSort)
            {
                case "3-3":
                    return new int[] { 3, 3 };
                case "4-2":
                    return new int[] { 4, 2 };
                case "2-2-2":
                    return new int[] { 2, 2, 2 };
                case "2-4":
                    return new int[] { 2, 4 };

                case "4-4":
                    return new int[] { 4, 4 };
                case "2-4-2":
                    return new int[] { 2, 4, 2 };
                case "6-2":
                    return new int[] { 6, 2 };

                case "2-2":
                    return new int[] { 2, 2 };

                case "2-2-2-2":
                    return new int[] { 2, 2, 2, 2 };
                default:
                    return new int[] { 3, 3 };
            }
        }

        #endregion "Methods"
    }