Putting your own Favorites on Safari's 4 Top Sites

Everyone is complaining that you can't set your own favorites in Safari 4's Top Sites page. But you can! What am I missing here? The following seems to work:

1. Click on the Top Sites icon (the 3 x 4 grid of boxes in the bookmarks bar).
2. Click the Edit button in the lower left corner.
3. Now, in the address bar, type in the address of the web site you want to be a favorite, but do not press the Enter key.
4. Drag the favorite icon next to the URL down into the sites, and watch the grid of images rearrange. Put the icon where you want it to show up in the grid of sites.
5. Once you have where you want it, press the pushpin.
6. Click Done.

Now the one down side is that the push pin doesn't seem to force the page to stay there during editing, and I could argue that is a bug. But this seems to work.