about the ComObject presentation:

* obj1 @ device level
* obj2 @ channel level (Channel1)
* obj3, obj4, obj5, obj6 @ channel level (Channel2) 
***
for Channel2

* obj3 @ channel level
* obj4 @ page level (object tree 1)
* **obj5, obj6 @ page level (object tree 2)**
***
for Channel - object tree 2

* obj5 @ page level
* obj6 @ sub page level (object tree 2 sub)
