CheckBox::init PHP Method

    public function init()
    {
        if (empty($_POST)) {
            if (isset($this->element->{$this->field})) {
                $this->checked[$this->field] = (bool) $this->element->{$this->field};
            } else {
                $this->checked[$this->field] = false;
            }
        } else {
            $this->checked[$this->field] = (bool) @$_POST[CHtml::modelName($this->element)][$this->field];
        }
    }