Chen,

>I can now narrow down what I want to know into two questions:
>1. Am I correct in stating that on a form at most only one grid can be navigated and the business object bound to that grid is the only one business object that raises navigating/navigated events caused by record pointer movement in the grid?

Only one grid at a time can be the "navigation control". You can dynamically change the navigation control to another grid if you so desire.

>2. If I am correct for question one, for the rest of grids on the form, when the record pointer is moved, what events do their bound business object raises?

If you have multiple grids on a form, only one of them is the navigation control at any given time.

However, if I understand your original question, when you navigate in the main grid, do you want to change the contents of the child/grandchild grids? What specifically are you looking for as a response in the other grids when you navigate in the parent. If you can tell me this, I can tell you what to do.

Regards,