@SuppressWarnings("unchecked")
    public MyPresenterWidget<?> open(final DocRef docRef,
                                     final boolean forceOpen,
                                     final boolean fullScreen,
                                     final TaskMonitorFactory taskMonitorFactory) {
        return open(docRef, forceOpen, fullScreen, null, taskMonitorFactory);
    }
4. This method will open a document and show it in the content pane.
stroom-core-client/src/main/java/stroom/document/client/DocumentPlugin.java