I have a grid that has several parent-child relationship. 

Is there a way in which I can disable the  AllowAddNew() on some child rows,

For example

1.

   1.1

   1.2

2.

   2.2

   ... If a certain condition is true, this row must have an allowaddnew property. This might be true to some relationship.

As you can see, In group 1, the AllowAddNew() property is disabled. But in 2, it may be enabled since theres a condition that it is true.

I hope you could understand what i mean. 

Thanks