title: ireport delete the class of a textFieldExpression
body: <p>i have something like this on my jrxml file on all the textFieldExpressions:</p>
  
  <pre><code>&lt;textFieldExpression class="java.lang.String"&gt;&lt;![CDATA[$F{Cia_par}+":"]]&gt;&lt;/textFieldExpression&gt;
  </code></pre>
  
  <p>then I change some positions of some fields and save, then the ireport made some changes on the textFieldExpressions like:</p>
  
  <pre><code>&lt;textFieldExpression&gt;&lt;![CDATA[$F{Cia_par}+":"]]&gt;&lt;/textFieldExpression&gt;
  </code></pre>
  
  <p>the class is been deleted, what can i do to avoid this everytime  i save?</p>