title: CKEditor Add new list plugin using UL tag
body: <p>I'm trying to add a new list plugin similar to bulletedlist so I've created a new button but as i'm trying to use the UL tag it pairs the new button called arrowedlist with the bulletedlist button. </p>
  
  <p>The reason I am doing this is so I can add a class to it (which I know how to do) so I can have 2 different buttons where 1 applies the default bullet list and the other applies UL tags with a class.</p>
  
  <p>The basic question is: is there a way I can add a button that uses UL the same way as bulletedlist does without it pairing the buttons together?</p>
  
  <pre><code>    // Register commands.
          editor.addCommand( 'numberedlist', new listCommand( 'numberedlist', 'ol' ) );
          editor.addCommand( 'bulletedlist', new listCommand( 'bulletedlist', 'ul' ) );
          editor.addCommand( 'arrowedlist', new listCommand( 'arrowedlist', 'ul' ) );
  
  
          // Register the toolbar button.
          if ( editor.ui.addButton ) {
              editor.ui.addButton( 'NumberedList', {
                  label: editor.lang.list.numberedlist,
                  command: 'numberedlist',
                  directional: true,
                  toolbar: 'list,10'
              });
              editor.ui.addButton( 'BulletedList', {
                  label: editor.lang.list.bulletedlist,
                  command: 'bulletedlist',
                  directional: true,
                  toolbar: 'list,20'
              });
              editor.ui.addButton( 'ArrowedList', {
                  label: editor.lang.list.arrowedlist,
                  command: 'arrowedlist',
                  directional: true,
                  toolbar: 'list,30'
              });
  
          }
  </code></pre>
  
  <p>Hopefully I'm not missing something obvious,
  thanks!</p>