title: Create TextBox without a border in PHPWord
body: <p>I'm trying to create a TextBox without a border in PHPWord, but setting <code>borderColor</code> or <code>borderSize</code> to <code>0</code> or <code>null</code> has no effect and I always get at least a black border around the text box.</p>
  
  <pre><code>$phpWord = new \PhpOffice\PhpWord\PhpWord();
  $textbox = $section-&gt;addTextBox(
      array(
          'alignment'   =&gt; \PhpOffice\PhpWord\SimpleType\Jc::END,
          'width'       =&gt; 200,
          'height'      =&gt; 40,
          'borderColor' =&gt; null,
          'borderSize'  =&gt; 0,
      )
  );
  $textbox-&gt;addText('dummy-text ...', null, array('alignment' =&gt; \PhpOffice\PhpWord\SimpleType\Jc::END));
  $objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord);
  $objWriter-&gt;save('dummy.docx');
  </code></pre>