understanding blackHoleCallback

Hi,

I am using the Security component, but would like to make sure that if
the security check fails, the User will get an Error message displayed
inside the Layout.

So, when I use just:

$this->Security->blackHole($this, 'You are not authorized to process
this request!');

I only get a blank white page with nothing else displayed. So I added:

$this->Security->blackHoleCallback = 'accessError';

With this, I now get the "You are not authorized to process this
request!" displayed, but it sits outside of my Layout, its actually
even outside the <!DOCTYPE >

What am I doing wrong? If I understand right, than I would need a
function accessError() , but what do i need to add into this to make
sure it is all in one Layout? I look forward to any help, I have read
backwards and forwards through the www but could not find an answer.
Thanks a lot for your help.

Luke
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