private async void btnAdd_Click(object sender, EventArgs e)
        {
            var view = new RetailEquipmentView(_manager, _mainPanel, new RetailEquipment()
            {
                Id = 0,
            });

            view.Anchor = Constants.FullScreenStyles;
            view.Width  = _mainPanel.Width;
            view.Height = _mainPanel.Height;
            _mainPanel.Controls.Clear();
            _mainPanel.Controls.Add(view);
        }
        private async void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == dataGridView1.Columns["col_Edit"].Index)
            {
                int id = (int)dataGridView1.Rows[e.RowIndex].Cells[0].Value;
                var retailEquipment = await _manager.Get <RetailEquipment>("RetailEquipments", id);

                var view = new RetailEquipmentView(_manager, _mainPanel, retailEquipment);
                view.Anchor = Constants.FullScreenStyles;
                view.Width  = _mainPanel.Width;
                view.Height = _mainPanel.Height;
                _mainPanel.Controls.Clear();
                _mainPanel.Controls.Add(view);
            }
        }