private void ZoomEvent(ZedGraphControl sender, ZoomState oldState, ZoomState newState)
{
if (sender == zedGraphControl1)
{
newState.ApplyState(zedGraphControl2.GraphPane);
zedGraphControl2.Invalidate();
zedGraphControl2.AxisChange();
} else {
newState.ApplyState(zedGraphControl1.GraphPane);
zedGraphControl1.Invalidate();
zedGraphControl1.AxisChange();
}
}