Hello,
In order to achieve the requirement, you could handle the ItemTapped event of the TreeView and in its handler use the Expand method to expand the specific item from the source collection.
Please take a look at the following code example:
From the code above the item is cast to the
business object you're using ( it's Item in the sample). When there are no children, they are added to the Item. In this way, the Expand method works fine on demand update.
I hope I could be of help.
Regards,
Didi
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