Controller::setAction heads-up

The comment for setAction() says that it "Internally redirects one
action to another." However, it doesn't really *redirect* so much as
simply call the action using call_user_func_array(). It amounts to
about the same thing, more or less, but there's something to keep in
mind:

public function someAction()
{
$this->setAction(
'error',
'This error message should display.',
array('foo' => 'bar')
);
}

private function error($msg = '', $data = array())
{
$this->set(compact('msg', 'data'));
}

This will display the error view *but* the $viewVars will not be set.
In order to make this work, set the access to the called action to
protected (or public, obviously), because setAction() is defined in
the parent class (Controller). If you absolutely need it to be
private, you'll have to override setAction() in your own controller.

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