private void bsUnitList_CurrentChanged(object sender, EventArgs e)
        {
            bsUnitItem.DataSource = SelectedUnit.LoadCopy(Database);

            bsNonUserList.DataSource  = SelectedUnit.GetUserList(Database, 0);
            bsCreatorGroup.DataSource = SelectedUnit.GetUserList(Database, EntryControlDatabase.MaterialCreatorGroup);
            bsSignerGroup.DataSource  = SelectedUnit.GetUserList(Database, EntryControlDatabase.MaterialSignerGroup);

            tblPanelUser.Visible = true;
        }