Highlight Page Location in Contents Tab (after Displayed via Search)

Hi,

I have transfered an old project from ForeHelp into RoboHelp8. 

In the previous CHM file, you could search and display a topic via the Search tab and the book(s) would expand and the page be displayed in the Contents tab.

Now my search works and I can display the topic via the Search tab.  However, when I click on the Contents Tab, the book is not expanded and the page is not highlighted.  The Default page is highlighted.

Can anyone tell me what configuration option I might have missed?