private void BtnAdicionar_Click(object sender, RoutedEventArgs e)
        {
            CadCategorias cad = new CadCategorias();

            cad.ShowDialog();
            AtualizarDG();
        }
        private void OpcaoAlterar_Click(object sender, RoutedEventArgs e)
        {
            MenuItem menuItem = (MenuItem)sender;

            ContextMenu contextMenu = (ContextMenu)menuItem.Parent;

            DataGrid item = (DataGrid)contextMenu.PlacementTarget;

            if (item.SelectedCells.Count > 0)
            {
                Categoria categ = (Categoria)item.SelectedCells[0].Item;

                CategoriaRepositorio repos = new CategoriaRepositorio();

                CadCategorias window = new CadCategorias();

                window.CategoriaAlteracao = categ;

                window.ShowDialog();

                AtualizarDG();
            }
        }