Edit sample code for FillTreeNode on TreeView Class page.

[XB1-Hexdecimal]

Edited sample code for FillTreeNode so that items in the node will show the StorageFile/Folder's name vs just "Windows.Storage.StorageFile" type.

[mikematteson]

@jwmsft : PR passed acceptance checklist. Please review further and approve/merge if appropriate. Thanks!

[jwmsft]

@XB1-Hexdecimal, thanks for the suggestion. However, the TreeViewNode.Content has to be the complete storage item, not just the name. Otherwise, the rest of the code that relies on the storage item doesn't work.
If you're seeing "Windows.Storage.StorageFile" in the TreeView, check your XAML for the TreeViewItemDataTemplate. This line is what tells the TreeView to display the storage item name: Text="{Binding Content.DisplayName}". The data template needs to be used to correctly display the storage item in the TreeView.