title: How to set excel header font and style in print preview?
body: <p>I'm using iReport 5.6.0 for creating a report,
  I want to add a header for excel when print preview, I tried adding this line in the jrxml</p>
  
  <pre><code>&lt;property name="net.sf.jasperreports.export.xls.sheet.header.left" value="My Left Text"/&gt;
  &lt;property name="net.sf.jasperreports.export.xls.sheet.header.center" value="My Center Text"/&gt;
  &lt;property name="net.sf.jasperreports.export.xls.sheet.header.right" value="My Right Text"/&gt;
  </code></pre>
  
  <p>This is working fine, but the problem is I don't know how to add font style or font size.</p>
  
  <p>Is there a way that I can add font style, font size, or font color? </p>