Using HtmlHelper in Controller

HI,

I have a controller similar to Pages where I want to load CSS
that would be loaded for all the pages.
This is the code how I'm doing it:

App::import('Helper', 'Html');
$html = new HtmlHelper();
$html->css('cssfile', null, null, false);

If I put this code to display() or beforeFilter(), or beforeRender()
I get a error that addScript() called on null object.
Seems to me that $view is not constructed yet.

If I put it to afterFilter() nothings happens.

So, what can I do?

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