title: JScrollPane on JComboBox
body: <p>I made a combobox but some of the elements are wider than the width of my box. So I tried to add a horizontal scrolpane and the only I could see is a scrolpane with a combobox inside!
  Certanly something I do wrong. So here is my code without the jscrolpane. </p>
  
  <pre><code>    issuerdocumentJComboBox=new JComboBox&lt;&gt;(issuermodel);//the compo box
      issuerdocumentJComboBox.setBounds(430, 120, 100, 30);
      searchDocumentesJPanel.add(issuerdocumentJComboBox);   
  </code></pre>
  
  <p>How can I add to the combobox a horizontal scrollpane?
  Thank you!</p>