Hi LarEpp
There are two places you look.
1. Expand the Windows folder and double-click your default
window. Down in the lower left corner of the Window Properties
dialog is an area labeled Tri-pane Options. Click to place a check
mark in the Auto-synchronize TOC. Click to place a check mark there
and close the dialog.
2. Now expand the Single Source Layouts area. Right click the
Microsoft HTML Help layout and choose Properties. Click the
Advanced... button. Now the TOC Styles tab. Place a check mark in
the "Always Show Selection" check box. Dismiss all dialogs, compile
and test!
Hope this helps some... Rick