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Код

public class DataGridViewControlCellEx : DataGridViewCell
    {
        public DataGridViewControlCellEx()
            : base()
        {
            this.Style.Format = "";
            this.Style.NullValue = null;            
        }        
        protected override void Paint(System.Drawing.Graphics graphics,
            System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle cellBounds,
            int rowIndex, DataGridViewElementStates cellState, object value,
            object formattedValue, string errorText, DataGridViewCellStyle cellStyle,
            DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
        {
            graphics.FillRectangle(Brushes.White, cellBounds);
            //бля, так клик работает!!!!!!!!!!!!!!
            //RaiseCellContentClick(new DataGridViewCellEventArgs(0, 0));
            if (value != null)
            {
                //полдучаем контрол
                var ctrl = value as Control;
                //ctrl.Visible = false;
                var cell = this.DataGridView[ColumnIndex, rowIndex];                

                //выставляем координаты
                ctrl.Location = cellBounds.Location;
                ctrl.Width = cellBounds.Width;
                //определяем высоту контрола
                ctrl.Height = (Int32)(graphics.MeasureString(ctrl.Text, ctrl.Font, ctrl.Width).Height);
                ctrl.BackColor = Color.White;
                //определяем необходимую высоту ячейки
                var requiredHeight = ctrl.Height + ctrl.Margin.Top + ctrl.Margin.Bottom + 10;
                //выставляем
                this.DataGridView.Rows[rowIndex].Height = requiredHeight;
                cellBounds = new Rectangle(cellBounds.X, cellBounds.Y, cellBounds.Width, requiredHeight);
                //добавляем контрол в коллекцию
                if (!this.DataGridView.Controls.Contains(ctrl))
                    this.DataGridView.Controls.Add(ctrl);
            }
            //выводим элементы интерфейса
            this.PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value,
                formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);            
        }

        public override Type ValueType
        {
            get
            {
                return typeof(String);
            }
        }
    }