C#

        protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)<br />
        {<br />
            Rectangle rec = new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);<br />
            DataGridViewMultiColumnComboColumn column = ownerCell.OwningColumn as DataGridViewMultiColumnComboColumn;<br />
            DataTable valuesTbl = column.valuesTbl;<br />
            string joinByField = column.joinFieldName;<br />
            SolidBrush NormalText = new SolidBrush(System.Drawing.SystemColors.ControlText);<br />
            object currentItem = Items[e.Index];<br />
            string currentText = GetItemText(currentItem);<br />
            <br />
            //If there is an item<br />
            if (e.Index > -1)<br />
            {<br />
                //first redraw the normal while background<br />
                SolidBrush normalBack = new SolidBrush(Color.White); //TODO: fix to be system edit box background<br />
                e.Graphics.FillRectangle(normalBack, rec);<br />
                if (DroppedDown && !(Margin.Top == rec.Top))<br />
                {<br />
                    int currentOffset = rec.Left;<br />
                    <br />
                    //now find this text corrent join field<br />
                    DataRow[] itemRows = valuesTbl.Select("[" + joinByField + "]='" + currentText + "'");<br />
<br />
                    SolidBrush HightlightedBack = new SolidBrush(System.Drawing.SystemColors.Highlight);<br />
                    if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
                    {<br />
                        //draw selected color background<br />
                        e.Graphics.FillRectangle(HightlightedBack, rec);<br />
                    }<br />
                    StreamWriter sw = new StreamWriter(File.OpenWrite("record"));<br />
                    foreach (DataRow currentRow in itemRows)<br />
                    {<br />
                        bool addBorder = false;<br />
<br />
                        foreach (object dataRowItem in currentRow.ItemArray)<br />
                        {<br />
                            string value = dataRowItem.ToString(); //TODO: support for different types!!!<br />
<br />
                            <br />
<br />
                            #region DrawLine<br />
                            if (addBorder)<br />
                            {<br />
                                //draw dividing line<br />
                                //currentOffset ++; <br />
                                SolidBrush gridBrush = new SolidBrush(Color.Gray); //TODO: make the border color configurable<br />
                                long linesNum = lineWidth;<br />
                                while (linesNum > 0)<br />
                                {<br />
                                    linesNum--;<br />
                                    Point first = new Point(rec.Left + currentOffset, rec.Top);<br />
                                    Point last = new Point(rec.Left + currentOffset, rec.Bottom);<br />
                                    e.Graphics.DrawLine(new Pen(gridBrush), first, last);<br />
                                    currentOffset++;<br />
                                }<br />
                                //currentOffset++;<br />
                            }<br />
                            else<br />
                                addBorder = true;<br />
                            #endregion<br />
<br />
                            //measure the string that we are goin to draw and cut it with wrapping if too large<br />
                            SizeF extent = e.Graphics.MeasureString(value, e.Font);<br />
                            Rectangle textRec = new Rectangle(currentOffset, rec.Y, (int)extent.Width + 20, rec.Height);<br />
<br />
                            //now draw the relevant to this column value text<br />
                            if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
                            {<br />
                                //draw selected<br />
                                SolidBrush HightlightedText = new SolidBrush(System.Drawing.SystemColors.HighlightText);<br />
                                //now redraw the backgrond it order to wrap the previous field if was too large<br />
                                e.Graphics.FillRectangle(HightlightedBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
                                //draw text as is <br />
                                e.Graphics.DrawString(value, e.Font, HightlightedText, textRec); sw.Write(value + "|");<br />
                            }<br />
                            else<br />
                            {<br />
                                //now redraw the backgrond it order to wrap the previous field if was too large<br />
                                e.Graphics.FillRectangle(normalBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
                                //draw text as is <br />
                                e.Graphics.DrawString(value, e.Font, NormalText, textRec); sw.Write(value + "|");<br />
                            }<br />
                            //advance the offset to the next position<br />
                            currentOffset += fixedAlignColumnSize;<br />
                        }<br />
                        sw.WriteLine();<br />
                    }<br />
                    sw.Close();<br />
                }<br />
                else<br />
                    //if happens when the combo is closed, draw single standard item view<br />
                    e.Graphics.DrawString(currentText, e.Font, NormalText, rec);<br />
            }<br />
        }<br />
        /**************************************************************************************************/<br />
    }