TreeViewItem
Description
TreeViewItem represents an expandable node inside TreeView. TreeViewItem is shown within TreeView; it is not a separate gallery destination.
Use it for a node within a TreeView hierarchy.

Example usage
<fluence:TreeView>
<fluence:TreeViewItem Header="Workspace" IsExpanded="True">
<fluence:TreeViewItem Header="Pages" />
</fluence:TreeViewItem>
</fluence:TreeView>
State and behavior
IsExpanded reveals children; selection and pointer states change the row.