public FunctionHelper() 
{
        super((JFrame) null, JMeterUtils.getResString("function_helper_title"), false); //$NON-NLS-1$
        init();
}

 public  void actionPerformed(ActionEvent e) 
{
        StringBuffer functionCall = new StringBuffer("${");
        functionCall.append(functionList.getText());
        Arguments args = (Arguments) parameterPanel.createTestElement();
        if (args.getArguments().size()  > 0) {
            functionCall.append("(");
            PropertyIterator iter = args.iterator();
            boolean first = true;
            while (iter.hasNext()) {
                Argument arg = (Argument) iter.next().getObjectValue();
                if (!first) {
                    functionCall.append(",");
                }
                functionCall.append(arg.getValue());
                first = false;
            }
            functionCall.append(")");
        }
        functionCall.append("}");
        cutPasteFunction.setText(functionCall.toString());
}

 public  void stateChanged(ChangeEvent event) 
{
        try {
            Arguments args = new Arguments();
            Function function = (Function) ((Class) functionMap.get(functionList.getText())).newInstance();
            List argumentDesc = function.getArgumentDesc();
            Iterator iter = argumentDesc.iterator();
            while (iter.hasNext()) {
                String help = (String) iter.next();
                args.addArgument(help, ""); //$NON-NLS-1$
            }
            parameterPanel.configure(args);
            parameterPanel.revalidate();
            getContentPane().remove(parameterPanel);
            this.pack();
            getContentPane().add(parameterPanel, BorderLayout.CENTER);
            this.pack();
            this.validate();
            this.repaint();
        } catch (InstantiationException e) {
        } catch (IllegalAccessException e) {
        }
}