public void RefreshView()
{
Image img = new Bitmap(_sheetField.Width, _sheetField.Height);
Graphics g = Graphics.FromImage(img);
SheetPrinting.DrawToothChartLegend(0, 0, _sheetField.Width, 0, _listDefs, g, null);
if (Image != null)
{
Image.Dispose();
}
Image = img;
g.Dispose();
}