private void CreateUnits()
{
var boxFactory = new BoxFactory();
var columnFactory = new ColumnFactory();
var rowFactory = new RowFactory();
for (int i = 0; i < 9; i++)
{
_boxes[i] = boxFactory.Factory(_cells, i);
_columns[i] = columnFactory.Factory(_cells, i);
_rows[i] = rowFactory.Factory(_cells, i);
}
}