How to include a preference page into the preference dialog - eclipse-rcp

Question

I know the way to add preference pages into the common preference dialog for an e3 RCP application. I have an e4 RCP application and I read that the preference dialog works different.
I found the way to open the common preference dialog, but I didn't find a way to include a customized preference page into the dialog.
public class PreferenceHandler {
#CanExecute
public boolean canExecute()
{
return true;
}
#Execute
public void execute(#Named(IServiceConstants.ACTIVE_SHELL) Shell shell, E4PreferenceRegistry prefReg,
#Optional #Named("preferencePageId") String pageId) {
PreferenceManager pm = prefReg.getPreferenceManager();
// Can display the standard dialog.
PreferenceDialog dialog = new PreferenceDialog(shell, pm);
if (pageId != null)
{
dialog.setSelectedNode(pageId);
}
dialog.create();
dialog.getTreeViewer().setComparator(new ViewerComparator());
dialog.getTreeViewer().expandAll();
dialog.open();
}
}

Answer 1

Most of the preference page code is part of e3 and isn't available in e4. Only the very basic JFace code is available.
So you will have to add each preference page you want directly to the PreferenceManager. Something like:
PreferenceManager pm = ... preference manager
IPreferencePage page = ... create your preference page
page.setTitle("title of the page");
IPreferenceNode node = new PreferenceNode("id of the page", page);
pm.addToRoot(node);