private void btnReg_Click(object sender, RoutedEventArgs e)
        {
            gdReportChild.Children.Clear();
            RegReportUC rr = new RegReportUC();

            _Imaster = rr;
            gdReportChild.Children.Add(rr);
        }
        private void btnVehicle_Click(object sender, RoutedEventArgs e)
        {
            gdReportChild.Children.Clear();
            VehicleReport vr = new VehicleReport();

            _Imaster = vr;
            gdReportChild.Children.Add(vr);
        }
        private void btnAccounts_Click(object sender, RoutedEventArgs e)
        {
            gdReportChild.Children.Clear();
            AccountsReportUC ar = new AccountsReportUC();

            _Imaster = ar;
            gdReportChild.Children.Add(ar);
        }