private JComponent createNorthPanel() {
    final ComboBox<Repository> repoSelector = new ComboBox<>(myCompareInfo.getRepositories().toArray(new Repository[0]));
    repoSelector.setRenderer(new RepositoryComboboxListCellRenderer());
    repoSelector.setSelectedItem(myInitialRepo);

    repoSelector.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        Repository selectedRepo = (Repository)repoSelector.getSelectedItem();
        myHeadToBranchListPanel.setCommits(getHeadToBranchCommits(selectedRepo));
        myBranchToHeadListPanel.setCommits(getBranchToHeadCommits(selectedRepo));
      }
    });

    JPanel repoSelectorPanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
    JBLabel label = new JBLabel(DvcsBundle.message("label.repository") + " ");
    label.setLabelFor(repoSelectorPanel);
    label.setDisplayedMnemonic(KeyEvent.VK_R);
    repoSelectorPanel.add(label);
    repoSelectorPanel.add(repoSelector);

    if (myCompareInfo.getRepositories().size() < 2) {
      repoSelectorPanel.setVisible(false);
    }
    return repoSelectorPanel;
  }
private JComponent createNorthPanel()