-1,
	private void prepareExpressions( Collection expressions, int groupLevel,			boolean afterGroup, boolean isDetailedRow, Context cx )	{	    if ( expressions == null )	        return;	    	    AggregateRegistry reg = this.aggrTable.getAggrRegistry( groupLevel,				isDetailedRow,				cx );	    Iterator it = expressions.iterator();	    while ( it.hasNext() )	    {	        prepareExpression((IBaseExpression) it.next(), groupLevel, cx, reg);	    }	}