Hi there!

To get the plus/minus control at the top of the group when grouping rows in Excel 2007, you can follow these steps:

1. Select the rows you want to group.
2. Right-click on the selected rows and choose "Group" from the context menu.
3. The plus/minus control will appear at the bottom of the group by default.
4. To move the plus/minus control to the top of the group, click on the "Data" tab in the ribbon.
5. Click on the "Group" button in the "Outline" group.
6. Choose "Settings" from the drop-down menu.
7. In the "Grouping dialog box", select "Top row" from the "Place summary below data" drop-down menu.
8. Click "OK" to save the changes.

That's it! Now the plus/minus control will appear at the top of the group when you collapse or expand it.