public Optional<SourceTabPresenter> open(final SourceLocation sourceLocation,
                                             final boolean forceOpen) {

        return super.openTabPresenter(
                forceOpen,
                new SourceKey(sourceLocation),
                sourceTabPresenter ->
                        sourceTabPresenter.setSourceLocationUsingHighlight(sourceLocation));

    }
4. This method will open the source and show it in the content pane.
stroom-core-client/src/main/java/stroom/data/client/SourceTabPlugin.java