How do I navigate the MiniBufExplorer without going into the MiniBufExplorer window?

In lines 170-174 of `minibufexpl.vim`:

```
"               To enable the optional mapping of <C-TAB> and <C-S-TAB> to a 
"               function that will bring up the next or previous buffer in the
"               current window, you can put the following into your .vimrc:
"
"                 let g:miniBufExplMapCTabSwitchBufs = 1

```

I added that to my `.vimrc`, restarted a blank Vim, then did the following commands to bring up multiple buffers (and consequently, the MiniBufExplorer):

```
:e somefile
:e someotherfile

```

Now, with my cursor inside the file window (not the MiniBufExplorer window), I try `Ctrl``Tab` and `Ctrl``Shift``Tab` to no effect. Something I missed?