private void btnInvert_Click(object sender, EventArgs e)
{
foreach (var curveItem in zedGraphControl.GraphPane.CurveList)
{
for (int i = 0; i < curveItem.Points.Count; i++)
{
curveItem.Points[i].Y = 100 - curveItem.Points[i].Y;
}
}
zedGraphControl.Invalidate();
}