Client Part - how to communicate with parent page?

Hi!

I trying to make a client part for SharePoint 2013 that should display info (e. g. Notes field) for currently selected item (e. g. Task).

But i can't get access to properties of parent window. Chrome throws security error with message like so:

How i can get notification via a callback when user select an item in a list view? (like callback that gets the ribbon)?
Or how i can get access to SP.ListOperation.Selection et cetera?

Is this scenario possible at all in SP 2013 client part?