void Blink(ListChangedEventArgs e)
        {
            if (BlinkTime <= 0)
            {
                return;
            }

            ChangedFieldInfoCollection changeFields = GetChangedFields();
            bool anyCellInvalidated = false;

            if (changeFields != null)
            {
                foreach (ChangedFieldInfo ci in changeFields)
                {
                    PropertyDescriptor pd   = _pdc[ci.Name];
                    object             item = SourceList[e.NewIndex];
                    DataRow            row  = item as DataRow;
                    BlinkState         bs   = BlinkState.None;

                    if (e.ListChangedType == ListChangedType.ItemAdded)
                    {
                        bs = BlinkState.NewRecord;
                    }
                    else
                    {
                        object value    = ci.NewValue;
                        object oldValue = ci.OldValue;
                        int    cmp      = CompareColumns.CompareNullableObjects(value, oldValue);
                        if (cmp > 0)
                        {
                            bs = BlinkState.Increased;
                            if (oldValue == null || oldValue is DBNull)
                            {
                                bs = BlinkState.NewValue;
                            }
                        }
                        else if (cmp < 0)
                        {
                            bs = BlinkState.Reduced;
                            if (value == null || value is DBNull)
                            {
                                bs = BlinkState.NullValue;
                            }
                        }
                    }

                    if (bs != BlinkState.None)
                    {
                        RowColumnIndex key = BlinkInfo.GetKey(e.NewIndex, ci.FieldIndex);
                        BlinkInfo      biOld;
                        if (_blinkTable.TryGetValue(key, out biOld))
                        {
                            int n = _blinkQueue.IndexOf(biOld);
                            if (n != -1)
                            {
                                _blinkQueue.RemoveAt(n);
                            }
                        }

                        BlinkInfo bi = new BlinkInfo(bs, e.NewIndex, ci.FieldIndex, Environment.TickCount, ci);
                        _blinkQueue.Add(bi);
                        _blinkTable[key] = bi;

                        int            record             = e.NewIndex;
                        int            rowIndex           = record + 1;
                        int            columnIndex        = bi.fieldIndex + 1;
                        RowColumnIndex cellRowColumnIndex = new RowColumnIndex(rowIndex, columnIndex);

                        RenderStyles.Clear(cellRowColumnIndex);
                        if (IsCellVisible(cellRowColumnIndex))
                        {
                            InvalidateCellRenderStyleBackground(cellRowColumnIndex);
                            anyCellInvalidated = true;
                        }
                    }
                }
            }
            if (anyCellInvalidated)
            {
                InvalidateVisual(false);
            }
        }
        private void OnSourceListItemChanged(ListChangedEventArgs e)
        {
            //Console.WriteLine("OnSourceListItemChanged: {0} {1}", e.NewIndex, ((DataRowView)SourceList[e.NewIndex])[0]);

            int  rowIndex                 = e.NewIndex + 1;
            bool rowVisible               = IsRowVisible(rowIndex);
            bool anyCellVisible           = false;
            ChangedFieldInfoCollection cc = GetChangedFields();

            if (cc.Count > 0)
            {
                foreach (ChangedFieldInfo fi in cc)
                {
                    int columnIndex = fi.FieldIndex + 1;

                    PropertyDescriptor pd = _pdc[columnIndex - 1];
                    if (pd.PropertyType == typeof(double))
                    {
                        _totals[columnIndex - 1] += fi.Delta;
                        if (!_invalidateWholeSummaryRow)
                        {
                            InvalidateCell(new RowColumnIndex(SourceList.Count + 1, columnIndex));
                        }
                    }

                    RowColumnIndex cellRowColumnIndex = new RowColumnIndex(rowIndex, columnIndex);
                    if (CurrentCell.CellRowColumnIndex == cellRowColumnIndex)
                    {
                        if (!CurrentCell.IsInConfirmChanges)
                        {
                            CurrentCell.RejectChanges();
                            Model.VolatileCellStyles.Clear(cellRowColumnIndex);
                            RenderStyles.Clear(cellRowColumnIndex);
                            CurrentCell.Renderer.RefreshContent();
                        }
                        else
                        {
                            this.InvalidateCell(cellRowColumnIndex);
                            continue;
                        }
                    }
                    else
                    {
                        InvalidateCell(cellRowColumnIndex);
                    }
                    if (rowVisible)
                    {
                        anyCellVisible |= IsColumnVisible(columnIndex);
                    }
                }
                if (_invalidateWholeSummaryRow)
                {
                    InvalidateCell(GridRangeInfo.Row(SourceList.Count + 1));
                }
            }
            else
            {
                for (int n = 0; n < _pdc.Count; n++)
                {
                    int            columnIndex = n + 1;
                    RowColumnIndex cell        = new RowColumnIndex(rowIndex, columnIndex);
                    if (rowVisible)
                    {
                        anyCellVisible |= IsColumnVisible(columnIndex);
                    }
                }
            }
            Blink(e);
            ProcessBlinkQueue();
            if (anyCellVisible)
            {
                InvalidateVisual(false);
            }
        }