private void btnDelete_Click(object sender, EventArgs e)
        {
            if (grdOverrides.SelectedRows.Count != 1)
            {
                return;
            }

            var sc = (ISpatialContextInfo)grdOverrides.SelectedRows[0].DataBoundItem;

            _fs.RemoveSpatialContextOverride(sc);
            UpdateSpatialContextList();
            OnResourceChanged();
        }