How to reproduce issue:
1. Select a server: Main node -> Inventory -> Child Resources -> Select an Apache Virtual Host (double-click)
2. Select an Directory, which physically contains some file(s) (Inventory -> Child Resources of an Apache Virtual Host)
3. Now switch to Inventory->Child Resources of the directory resource.

The directories for an Apache Virtual Host do not contain any child their Inventory Tab. The same situation is for default directories (www/html, www/icons, ...) and for manually created. Even when the directory is not empty physically.
What kind of inventory resources are intended to be shown here?