I would like to use tracker in my custom actions. The tracker works well for the class taking Action as its parameter. However, Can I use tracker in my self-defined classes which are not taking Action/ FormAction as parameter?
Besides, can I add new function into the an action class? For example, if I define a function sum() in class ActionCalculation(Action), there will be an error saying “name ‘sum’ is not defined”. What can I to with this?