* The number of columns to span
*/
public void addWorksheetFooter(WorksheetItem item, int colspan) {
currentColumnIndex = startColumnIndex;
currentRowIndex = maxRowIndex;
UIMergeCells mergeCommand = new UIMergeCells();
mergeCommand.setStartColumn(currentColumnIndex);
mergeCommand.setStartRow(currentRowIndex);
mergeCommand.setEndColumn(currentColumnIndex + colspan - 1);
mergeCommand.setEndRow(currentRowIndex);
executeCommand(mergeCommand);
addItem(item);
}