Methods not being inherited by AppController

As the title implies, any methods I define within app_controller are
showing an error as undefined when calling that method from anyone of
my controllers. I did some searching and see that this should not be
an issue, any thoughts?

I am using version 1.2 and my AppController is located at /app/
app_controller.php.

I am calling the below method from another controller:

function sendMessage($from, $to, $subject, $msgBody)
{

$this->Email->sendAs = 'text';
$this->Email->from = $from;
$this->Email->to = $to;
$this->Email->subject = $subject;
$this->Email->send($msgBody);

echo "success";

}//end sendMessage

gives me:

Fatal error: Call to undefined function sendMessage()

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