If you select an object that contains parameters which can be regenerated, the toolbar will enable more options.
1. The selected object, in this case an FX Draw diagram. It is definitely an Efofex object because the Edit button is active.
2. This object contains parameters which can be regenerated so the toolbar has enabled the regenerate button.
3. The toolbar also shows us the parameters connected to this particular object. You do not really need to use this information but it does allow you to see which objects share the same set of parameters.