Pressing F1 does not expand the TOC in MS HTML Help

Question

I'm using version 6 of RoboHelp.
When my users click F1 in my software application, I want the
TOC to expand on the left-hand side of the Microsoft HTML Help
window so they can see the page that is displayed to them. I've
checked the "Always Show Selection" box in the HTML Help - Advanced
Settings - TOC Styles window. However, when I compile, it doesn't
work.

Answer 1

I've been doing some experimenting with the options in that
Windows Properties dialog box found under Edit-Windows.
I created a brand new test project, which contains only one
topic. I added that one topic to the TOC. Then, I performed 2 tests
as follows:
Test 1: I selected Windows from the Edit menu to open the
Windows Properties dialog box. I looked at the Search checkbox to
make sure it was checked on. I generated my primary layout. In the
Microsoft HTML Help window, there was, indeed, a Search tab.
Test 2: I re-opened the Windows Properties dialog box and
removed the checkmark from the Search box. I generated my primary
layout again. However, the Search tab still appeared in the
Microsoft HTML Help window, even though I unchecked the box.
Test 3: I changed the content of one page of my project.
Then, I re-generated my primary layout again. This time, the Search
tab disappeared from the Microsoft HTML Help window.
In summary, it appears that the options in the Windows
Properties dialog box do not affect the primary layout unless some
content in the project is changed.