*/
private void setCellEmpty( short col, short row ) throws com.sun.star.uno.Exception
{
// as long as #i29130# is not fixed, we do not set the cell to "empty", but to
// an invalid formular, which serves well for our purpose
XCellRangeFormula cell = (XCellRangeFormula)UnoRuntime.queryInterface( XCellRangeFormula.class,
m_document.getSheet( 0 ).getCellByPosition( col, row )
);
String[][] args = new String[][] { new String[] { "=INVALID_FUNCTION()" } };
cell.setFormulaArray( args );
}