Class clazz = null;
try { clazz = Class.forName(col.getValueClassNameForExpression());
} catch (ClassNotFoundException e) {
throw new DJException("Exeption creating chart variable: " + e.getMessage(),e);
}
JRDesignExpression expression = new JRDesignExpression();
//FIXME Only PropertyColumn allowed?
expression.setText("$F{" + ((PropertyColumn) col).getColumnProperty().getProperty() + "}");