}
getLayoutManager().getReferencesMap().put(group.getName(), djgroup);
group.setCountVariable(new JRDesignVariable());
group.setGroupFooter(new JRDesignBand());
group.setGroupHeader(new JRDesignBand());
JRDesignExpression jrExpression = new JRDesignExpression();
CustomExpression expressionToGroupBy = column.getExpressionToGroupBy();