Thanks.
There isn't currently a supported way to suppress this menu using that build. We agree that this should be possible and are currently looking at adding support for it. We'll follow up here when we have more information.
As of tomorrow's nightly build (2018-06-17), you should be able to get the result you're after either by setting the listGrid's showHeaderSpanContextMenu property to false, or overriding its getHeaderSpanContextMenuItems method.
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