The headers can have two actions associated with them:
sorting - that happens when you click a header cell. You can see one way to get data about sorting in the grid here - through a dedicated event. For the MVC helpers, you use the same approach - capturing a JS event.
hover - when the mouse pointer enters the header cell area. There isn't specific API exposed for this, but you can use jQuery to handle hover events for the th elements and get their inner text.
There isn't a selection feature for that, however. If I am missing something, please provide some more details on the grid feature you are using so I can offer a more concrete answer.
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