private void cboFeatureLayer_SelectedIndexChanged(object ssender, EventArgs e)
{
cboField.Items.Clear();
ILayer featureLayer = _utilities.Layer(cboFeatureLayer.Text);
//cboField.Items.AddRange(_utilities.NumberFieldsWithDomain(featureLayer).ToArray());
cboField.Items.AddRange(_utilities.NumberFieldsNotRequired(featureLayer).ToArray());
}