I have an application that uses a typical pattern of core-items inside of 
core-submenus inside of a core-menu. This menu is in a drawer. My main 
content area is a very long text content based page. Clicking on any of the 
core-items, jumps you to a specific anchor in the main content. 

My question is how can I programmatically control which 
core-item/core-submenus are selected? I'd like to implement the pattern 
where a user scrolls the main content area to a different section and the 
core-menu selection changes in unison based on what text content is 
currently visible. I can monitor scroll events in my main window, but how 
would I change which item is selected in the core-menu?

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