private void btnCancel_Click(object sender, EventArgs e)
{
mf.ABLine.isEditing = false;
int last = mf.ABLine.numABLineSelected;
mf.FileLoadABLines();
mf.ABLine.numABLineSelected = last;
mf.ABLine.refPoint1 = mf.ABLine.lineArr[mf.ABLine.numABLineSelected - 1].origin;
mf.ABLine.abHeading = mf.ABLine.lineArr[mf.ABLine.numABLineSelected - 1].heading;
mf.ABLine.SetABLineByHeading();
mf.ABLine.isABLineSet = true;
mf.ABLine.isABLineLoaded = true;
mf.ABLine.moveDistance = 0;
mf.layoutPanelRight.Enabled = true;
Close();
}