title: JFace: how to add multiple selection to a cell in a TableViewer
body: <p>This question is about how I could add a multi-selection <code>ComboBoxCellEditor</code>, or a multiple <code>BooleanCellEditor</code> to a cell in a <code>TableViewer</code>. The main aim is to have a multi selection in a cell.</p>
  
  <p>I am using the snippets at <a href="http://wiki.eclipse.org/index.php/JFaceSnippets" rel="nofollow">http://wiki.eclipse.org/index.php/JFaceSnippets</a> and <a href="http://www.eclipse.org/swt/snippets/" rel="nofollow">http://www.eclipse.org/swt/snippets/</a>, and I now have a fairly good Table using <code>TableView</code> with all editing supports, label providers, content providers. Inside the cells I now have a <code>TextCellEditor</code> or a <code>ComboBoxCellEditor</code>.</p>
  
  <p>The thing is: I want a multiple selection, and I don't know how.</p>
  
  <ol>
  <li><p>The code of <code>org.eclipse.nebula.widgets.nattable.edit.editor.ComboBoxCellEditor</code> seems to have multipleselection, but I am having always a <code>java.lang.NoClassDefFoundError</code> while trying to use the external Nebula classes</p></li>
  <li><p>The JFace snippet <code>Snippet061FakedNativeCellEditor</code> provides me with only one checkbox, and adapting this code to my code is difficult.</p></li>
  </ol>
  
  <p>Many thanks.</p>