Hi,
I have tested your solution but it doesn't work when the collection is scrolled. If you have few items, then it is OK (as your sample).
But when the collection doesn't fit to the listview and you start to scroll to the down :
1- When you scroll back to the top and expand first or second or third item, it is just empty
2- If you expand first or second or third item and start to scroll down, some other items in the list are expanded already.
Plus scrolling up and down is extremely slow and lags very much.
I have attached the same solution you have added with more items so that you can test...
Regards
Attachment:
1468011524798963_2c79d13a.rar