Can't Call StartActivityForResult in Anko

I'm pretty new to android, and I'm trying to learn it with kotlin. In this code

mHelp.setOnClickListener {context.startActivity<HelpActivity>()}
mSettings.setOnClickListener {
    context.startActivityForResult<LocalSettingsActivity>(
          LOCAL_SETTINGS_REQUEST,
          "coords" to this.board.mCoords,
          "drag" to this.mWhiteStones[0].drag )
}

the call to startActivity works fine, but I get a syntax error on the call to startActivityForResult. The error says that it's a receiver type mismatch, and that the receiver should be an Activity or a Fragment. On the other hand, the receiver for StartActivity can be a Fragment, a Context, or an AnkoContext<*> (whatever that is).

Of course, I can make this work (I think) by building the Intent and not using anko.StartActivityForResult, but I'd to understand what's going on.

It has occurred to me that perhaps I've got my code organized all wrong. The code above is in a custom ViewGroup that has the ImageButtons mHelp and mSettings as children, and context is the Context passed to the ViewGroup's primary constructor. Should I perhaps be setting the onClickListeners in the Activity that manages the custom ViewGroup? If not, how would I call StartActivityForResult?