TreeView.SetExpanded

public bool SetExpanded(int id, bool expanded);

Parameters

id	TreeViewItem ID.
expanded	True expands item. False collapses item.

bool True if item changed expanded state, false if item already had the expanded state.

Set a single TreeViewItem to be expanded or collapsed.

public void SetExpanded(IList<int> ids);

ids	List of item IDs that should be expanded.

Set the current expanded TreeViewItems of the TreeView. This will overwrite the previous expanded state.