Not tested but you should be able to do that by providing a Cell to the header that listens to the "contextmenu" event (and possibly the "click" event, you'd have to try on each browser), so that its onBrowserEvent will be called back when such an event is fired on the header's cell. In other words, you have to do it at the Cell level (but it's relatively easy to wrap any Cell into one that additionally listens to and handles "contextmenu" events)
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