MenuRoot property.

After upgradnig from 7.11 to 11 I have encountered error of missing property of page. I have code like this :

(PageReference)CurrentPage["MenuRoot"]

And property MenuRoot is missing. In old application MenuRoot has value. Question :

Is this property comes from Epi? Because I can't find it in application code. And if it comes which can I use instead?

Have someone encountered this property?