How to use TreeExpanderWidget, there is no example or specification about this widget, anyone can tell me how to use it thanks.

Now I have a TreeView, it works fine. But all the items in the tree are displayed directly, I want they are collapse at start and just expand on click event ,just like the following picture .
I searched all the SDK ,there is no example about this .
could any one give some example or tell me how to set this parameters. thanks.

Usually a tree is created with collapsed nodes. Are you sure that you don't somewhere call ITreeViewMgr::ExpandNode()?
If your expanded nodes only reflect previous state, the header comment in ITreeViewMgr::ChangeRoot() mentions ClearTree(kTrue) for exactly that case ...
Dirk

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How to use TreeExpanderWidget, there is no example or specification about this widget, anyone can tell me how to use it thanks.

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