private void EndEdit()
{
notifyCellDirty();
editingControl.DropDown.Close(ToolStripDropDownCloseReason.ItemClicked);
float val;
if (float.TryParse(offITextBox.Text, out val))
value.EndI = val;
if (float.TryParse(offJTextBox.Text, out val))
value.EndJ = val;
if (float.TryParse(factorTextBox.Text, out val))
value.Factor = val;
if (changed)
notifyCellDirty();
}