TreeView Sorting

Hi,

I am trying to sort a TreeView in the standard way of all nodes with children (folders) at the top of a level in the tree, then all file nodes underneath them (without children). With the folder nodes and file nodes sorted alphabetically.

I'm not sure if that makes sense but what I am going for is a similar sort to what is used within Windows Explorer for files and folders.

The sorted property for the TreeView just sorts everything alphabetically, not taking into consideration child nodes. Any help would be greatly appreciated.

Thanks,
Bob