JRDesignExpressionChunk chunk = new JRDesignExpressionChunk();
chunk.setText(columnVO.getDbName());
chunk.setType(JRDesignExpressionChunk.TYPE_FIELD);
JRDesignExpression expression = new JRDesignExpression();
expression.addChunk(chunk);
expression.setValueClass(columnVO.getFieldClass());
JRDesignTextField textField = new JRDesignTextField();
textField.setWidth(columnVO.getWidth());
textField.setHeight(bDetalle.getHeight());
textField.setX(px);