Umm, that's deliberate. The CSH is only supposed to launch & display the one topic that it's linked to - you use the "Show" link in the top right corner of the displayed topic to show the ToC and all the other buttons. If you don't like the wording of "Show" you can edit it via the Project Settings > Language settings.
I wouldn't say that it is deliberate, it's more that it is the default. Many prefer to open even CSH with the TOC etc. You need to change the call. See http://www.wvanweelden.eu which has a lot of technical information or see my site.
See www.grainge.org for RoboHelp and Authoring tips
And with a window you can also force the navigation pane to show.
Sorry – rephrase – “deliberate” = “working by design that way” ;>)