private void MousePlot_FormClosing(object sender, FormClosingEventArgs e)
{
settings.lines = checkBoxLines.Checked;
settings.transparent = checkBoxBgnd.Checked;
settings.fixedsize = checkBoxSize.Checked;
settings.stem = checkBoxStem.Checked;
settings.plotindex = comboBoxPlotType.SelectedIndex;
settings.xpos = Location.X;
settings.ypos = Location.Y;
}