/**
   * Builds the SWT controls for the three areas of a compare/merge viewer.
   *
   * <p>Calls the hooks <code>createControls</code> and <code>createToolItems</code> to let
   * subclasses build the specific content areas and to add items to an enclosing toolbar.
   *
   * <p>This method must only be called in the constructor of subclasses.
   *
   * @param parent the parent control
   * @return the new control
   */
  protected final Control buildControl(Composite parent) {

    fComposite =
        new Composite(parent, fStyles | SWT.LEFT_TO_RIGHT) { // we
          // force
          // a
          // specific
          // direction
          public boolean setFocus() {
            return ContentMergeViewer.this.handleSetFocus();
          }
        };
    fComposite.setData(CompareUI.COMPARE_VIEWER_TITLE, getTitle());

    hookControl(fComposite); // hook help & dispose listener

    fComposite.setLayout(new ContentMergeViewerLayout());

    int style = SWT.SHADOW_OUT;
    fAncestorLabel = new CLabel(fComposite, style | Window.getDefaultOrientation());

    fLeftLabel = new CLabel(fComposite, style | Window.getDefaultOrientation());
    new Resizer(fLeftLabel, VERTICAL);

    fDirectionLabel = new CLabel(fComposite, style);
    fDirectionLabel.setAlignment(SWT.CENTER);
    new Resizer(fDirectionLabel, HORIZONTAL | VERTICAL);

    fRightLabel = new CLabel(fComposite, style | Window.getDefaultOrientation());
    new Resizer(fRightLabel, VERTICAL);

    if (fCenter == null || fCenter.isDisposed()) fCenter = createCenterControl(fComposite);

    createControls(fComposite);

    fHandlerService =
        CompareHandlerService.createFor(
            getCompareConfiguration().getContainer(), fComposite.getShell());

    initializeToolbars(parent);

    return fComposite;
  }
  public void createCustomUIPanel(final Shell dialog) {
    customUIPanel = new Composite(dialog, SWT.NONE);
    GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, false);
    customUIPanel.setLayoutData(gridData);
    customUIPanel.setLayout(new GridLayout(1, false));

    comboPanel = new Composite(customUIPanel, SWT.NONE);
    comboPanel.setLayoutData(gridData);
    comboPanel.setLayout(new GridLayout(2, false));
    comboPanel.setData("donotremove");

    Label lookInLabel = new Label(comboPanel, SWT.NONE);
    lookInLabel.setText(Messages.getString("VfsFileChooserDialog.LookIn"));
    gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false);
    lookInLabel.setLayoutData(gridData);

    customUIPicker = new Combo(comboPanel, SWT.READ_ONLY);
    gridData = new GridData(SWT.LEFT, SWT.CENTER, true, false);
    customUIPicker.setLayoutData(gridData);

    if (!showLocation) {
      comboPanel.setParent(fakeShell);
    }

    if (!showCustomUI) {
      customUIPanel.setParent(fakeShell);
    }

    customUIPicker.addSelectionListener(
        new SelectionListener() {

          public void widgetSelected(SelectionEvent event) {
            selectCustomUI();
          }

          public void widgetDefaultSelected(SelectionEvent event) {
            selectCustomUI();
          }
        });
    customUIPicker.addKeyListener(
        new KeyListener() {

          public void keyReleased(KeyEvent arg0) {
            selectCustomUI();
          }

          public void keyPressed(KeyEvent arg0) {
            selectCustomUI();
          }
        });

    boolean createdLocal = false;
    for (CustomVfsUiPanel panel : customUIPanels) {
      if (panel.getVfsScheme().equals("file")) {
        createdLocal = true;
      }
    }

    if (!createdLocal) {
      CustomVfsUiPanel localPanel =
          new CustomVfsUiPanel("file", "Local", this, SWT.None) {
            public void activate() {
              try {
                File startFile = new File(System.getProperty("user.home"));
                if (startFile == null || !startFile.exists()) {
                  startFile = File.listRoots()[0];
                }
                FileObject dot = fsm.resolveFile(startFile.toURI().toURL().toExternalForm());
                rootFile = dot.getFileSystem().getRoot();
                selectedFile = rootFile;
                setInitialFile(selectedFile);
                openFileCombo.setText(selectedFile.getName().getURI());
                resolveVfsBrowser();
              } catch (Throwable t) {
              }
            }
          };
      addVFSUIPanel(localPanel);
    }
  }