private void Button1_Click(object sender, EventArgs e)
        {
            FrmClients fc = new FrmClients
            {
                SelectionMode = true
            };

            fc.ShowDialog();
            if (fc.SelectedClient != null)
            {
                _client            = fc.SelectedClient;
                _document.ClientID = fc.SelectedClient.ID;
                BindClientProperties();
            }
        }
        private void Clients_Click(object sender, EventArgs e)
        {
            Form clients = new FrmClients(true);

            clients.Show();
        }