Can initialize max row and column automatically by detecting file content

Can choose to initialize its maxVisibleRows and maxVisibleColumns per the loaded sheet.

Just leave Spreadsheet's two attributes maxVisibleRows and maxvisibleColumns to their default value zero(0) and then Spreadsheet component will detect the loaded sheet and set its maxium visible rows/columns per the sheet's data. Would at least be 200(rows) x 40(columns) if the data range is smaller.