I'm using Twenty Ten theme on one of my underconstruction blogs and eventually found that Custom Menu feature is making some problems. I have a total of 7 pages. 5 of them are parent pages and one of them has 2 child pages. By default, all of those pages are shown in the navigation bar right below the header image. Hovering on the About page shows up the child pages.
However, after I added a custom menu there to put 3 parent pages off the navigation bar, I noticed that the About page -- which has 2 child pages -- doesn't show up child pages in a drop-down menu, as it should have. I've tried everything I could, but still no fix. If I manually add that child page to the menu, it shows up as a parent page, not in a drop-down.
Please anyone help me how do I use that custom menu with the drop-down option turned on?