Set options on current Renderer.

def _set_render_options(cls, options, backend=None):
        """
        Set options on current Renderer.
        """
        if backend:
            backend = backend.split(':')[0]
        else:
            backend = Store.current_backend

        cls.set_backend(backend)
        if 'widgets' in options:
            options['widget_mode'] = options['widgets']
        renderer = Store.renderers[backend]
        render_options = {k: options[k] for k in cls.render_params if k in options}
        renderer.param.set_param(**render_options)