public function setColumns($columnText, $css = null, $class = null)
    {
        
        $ctr = 0;
        $text = '';
        $colCss = array();
        $dataClass = '';
        $thClass = '';

        foreach($columnText as $values)
        {
            $text .= '<th '.$dataClass.' class="'.$class.'">' . $values . '</th>';
            $ctr++;
        }

        
        $this->_columns .=  $text;
    }