Cant add parent items

[razkoko1]

First thanks for such a good libary, this libary is great and help me a lot !
When I try to add parent item to the adapter their are two options or i add parent object and nothing happend, or I add to list of object and than the adapter cant recognize that I added more objects than the list that was before and it pop up error of out of array, i took a look in the code and i think that this happend because the adapterhelper. because it dont update the adapterhelper it dont know that thier are more objects that was added.
I try to add 20 products each time to the adapter and I stuck with this error. hope you have some ideas for make this work.

have a good day !
thanks !