title: Adding vertical scroll to a JPopupMenu?
body: <p>I would like to add a way to scroll through menu items in a <code>JPopupMenu</code>, much like scrolling through a list of items in a <code>JComboBox</code>.</p>
  
  <p>Let's say I have 10 menu items. I would like to display only 5 menu items at a time, and I would use a vertical scroll button at the bottom or top of the <code>JPopupMenu</code> to show the menu items that are not listed and hide the ones that I just saw.</p>
  
  <p>Is it possible? I am using JIDE Software's <code>JideSplitButton</code>, which displays a <code>JPopupMenu</code> when clicked. I am trying to keep the look and feel of the command bar on which I placed the <code>JideSplitButton</code>, so I don't want to replace it with a <code>JComboBox</code> unless I really have to.</p>