private void Add_new_test_cb_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch (Add_new_test_cb.SelectedIndex)
            {
            case 0:
            {
                selected_index = 1;
                Setup_view_wifi sv = new Setup_view_wifi(this);
                sv.Show();

                break;
            }

            case 1:
            {
                selected_index = 2;
                Setup_view_wifi sv = new Setup_view_wifi(this);
                sv.Show();

                break;
            }

            case 2:
            {
                selected_index = 3;
                Setup_view_bluetooth sv = new Setup_view_bluetooth(this);
                sv.Show();

                break;
            }

            case 3:
            {
                selected_index = 4;
                Setup_view_bluetooth sv = new Setup_view_bluetooth(this);
                sv.Show();

                break;
            }
            }
        }
        private void Add_new_test_cb_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch (Add_new_test_cb.SelectedIndex)
            {
                case 0:
                    {
                        selected_index = 1;
                        Setup_view_wifi sv = new Setup_view_wifi(this);                        
                        sv.Show();

                        break;
                    }
                case 1:
                    {
                        selected_index = 2;
                        Setup_view_wifi sv = new Setup_view_wifi(this);
                        sv.Show();

                        break;
                    }
                case 2:
                    {
                        selected_index = 3;
                        Setup_view_bluetooth sv = new Setup_view_bluetooth(this);
                        sv.Show();

                        break;
                    }
                case 3:
                    {
                        selected_index = 4;
                        Setup_view_bluetooth sv = new Setup_view_bluetooth(this);
                        sv.Show();

                        break;
                    }
            }
        }