private void adicionarToolStripMenuItem_Click(object sender, EventArgs e)
        {
            TelaCadastrarCliente cadastrar = new TelaCadastrarCliente();

            cadastrar.MdiParent = this;
            cadastrar.Show();
        }
        private void tbCadastrarCliente_Click(object sender, EventArgs e)
        {
            TelaCadastrarCliente cadastro = new TelaCadastrarCliente();

            cadastro.FormClosed += Cadastro_FormClosed;
            cadastro.MdiParent   = this.MdiParent;
            cadastro.Show();
        }
        private void dgCliente_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            object obj = Util.GetCellValueFromColumnHeader(dgCliente.SelectedRows[0].Cells, "CPF");

            if (obj == null)
            {
                return;
            }

            String CPF = (String)Util.GetCellValueFromColumnHeader(dgCliente.SelectedRows[0].Cells, "CPF");

            TelaCadastrarCliente tela = new TelaCadastrarCliente(CPF);

            tela.FormClosed += Tela_FormClosed;
            tela.MdiParent   = this.MdiParent;
            tela.Show();
        }