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Dynamically populate TreeView children on first expand

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I have a specific need: my app will have to display many (MANY) data on a tree view. So I want to dynamically populate it on expand.

I first populate root elements, that I want that on double clique (expand), while responding to TVN_EXPANDING, this item will have it's children.

The problem is that when an item has no children, impossible to expand it! The [+] button doesn't appear.

What's the best solution to this? I think I will test to add to each item a dummy child that will be deleted in TVN_EXPANDING.

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