Sometimes, it can happen that the TypeScript definitions are missing a declaration of a specific member, especially if it has been added recently.
Your examples:
1. commandCallBack() method is specific to DayPilot Pro versions with integrated server-side backend (all editions except of DayPilot Pro for JavaScript). It's not included in the JavaScript version intentionally.
2. onRowCreate and onRowCreated event handlers are now included in the TypeScript definitions in the latest build (2018.3.3392). It was missing by accident.
Please let me know if there is any problem.