void Fill()
{
IEnumerable <string> l = FiniteMatrixDerivationTransformer.GetNames(filter);
boxes[0].FillCombo(l);
boxes[0].SelectCombo(filter.Transition);
boxes[1].FillCombo(l);
boxes[1].SelectCombo(filter.Measurements);
l = filter.GetAllNames <IMeasurements>();
string[] s = new string[] { filter.RealMeasurements, filter.CovariationState, filter.CovariationMeasurements };
for (int i = 0; i < s.Length; i++)
{
ComboBox box = boxes[i + 2];
box.FillCombo(l);
box.SelectCombo(s[i]);
}
FillNumbers(false);
}