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