Method XbpCellGroup():scrollUp() Foundation
Scrolls cell contents downwards and clears the cells at the top.
:scrollUp( <nRows> ) --> nScrolled
The method returns as a numeric value the number of rows that are actually scrolled.
The :scrollUp() method changes the display of the XbpCellGroup object by shifting the cells a specified number of rows downwards. The contents of the cells at the bottom of the cell group is overwritten while the cells at the top become empty. The method :setCell() must be called afterwards to fill the empty cells with values.
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