How use model on cake shell

Hi, i newbie on cakephp.
I want to develop a shell aplication, but when i try to use model no
error shows and application don't execute.

My code
<?php
class AlertsShell extends Shell {

var $uses = array('Pais');

function main() {
$this->out('First line to show');
$results = $this->Pais->find('all');
$this->out('End execution');
}

}
?>

I try to use App:import('Model','Pais'); with the same result.
Model 'Pais' is ok, and works on webpage.

If i delete 'var $uses = array('Pais');' and '$results = $this->Pais-
>find('all');', program execute ok.

I'm mad trying to execute shell program and uses model.
Someone can help me?. Thanks for all and sorry for my bad english.

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