public void addManifestation() {
   final FileDialog fileDialog = new FileDialog(getSite().getShell(), SWT.OPEN);
   fileDialog.setFilterExtensions(new String[] {"*.xml;*.raid", "*.raid"});
   fileDialog.setFilterNames(
       new String[] {"Fichiers chronosRAID (*.xml,*.raid)", "Projet ChronosRAID (*.raid)"});
   final String fileName = fileDialog.open();
   if (fileName != null) {
     ProjectManager.openProject(fileName);
   }
 }
  @Override
  public void createPartControl(final Composite parent) {
    final GridData gridData1 = new GridData();
    gridData1.horizontalAlignment = FILL;
    gridData1.verticalAlignment = GridData.CENTER;
    final GridLayout gridLayout = new GridLayout();
    gridLayout.numColumns = 1;
    final GridData gridData = new GridData();
    gridData.grabExcessVerticalSpace = true;
    gridData.horizontalAlignment = FILL;
    gridData.verticalAlignment = FILL;
    gridData.grabExcessHorizontalSpace = true;
    final Composite top = new Composite(parent, SWT.NONE);
    top.setLayout(gridLayout);
    labelTitre = new Label(top, SWT.NONE);
    labelTitre.setText("Navigateur");
    labelTitre.setLayoutData(gridData1);
    tree = new Tree(top, SWT.MULTI);
    tree.setLayoutData(gridData);
    treeViewer = new TreeViewer(tree);
    getSite().setSelectionProvider(treeViewer);
    final Image fondImage = ImageReg.getImg(IMG_VIEW_BG);
    tree.setBackgroundImage(fondImage);
    tree.addSelectionListener(
        new SelectionAdapter() {
          @Override
          public void widgetSelected(final SelectionEvent element) {
            labelTitre.setText(tree.getSelection()[0].getText());
            try {
              getViewSite().getPage().showView(NAVIGATOR_VIEW_ID);
            } catch (PartInitException e) {
              e.printStackTrace();
            }
          }
        });

    applyNavigatorDoubleClick(tree, getSite().getWorkbenchWindow());

    treeViewer.setLabelProvider(new NavigatorLabelProvider());
    treeViewer.setContentProvider(createContentProvider());

    final ProjectManager manager = getProjectManager();
    manager.addProjectManagerListener(this);
    treeViewer.setInput(manager);
    defineWorkbenchPopupMenu(getSite(), treeViewer);
    initDragAndDrop();

    applyTooltipNavigator(tree);

    final TreeEditor editor = new TreeEditor(tree);
    editor.horizontalAlignment = SWT.CENTER;
    editor.grabHorizontal = true;
    editor.grabVertical = true;

    tree.addKeyListener(new TreeEditing(tree, editor));

    final Clipboard clipboard = new Clipboard(getSite().getShell().getDisplay());
    final IActionBars bars = getViewSite().getActionBars();
    bars.setGlobalActionHandler(CUT.getId(), new CutStepAction(treeViewer, clipboard));
    bars.setGlobalActionHandler(COPY.getId(), new CopyStepAction(treeViewer, clipboard));
    bars.setGlobalActionHandler(PASTE.getId(), new PasteTreeGadgetAction(treeViewer, clipboard));
  }