As you see in following picture, the column header of case 1 show the whole text, but for case 2, the column header only show part of the text because we made the width small, so how to add tooltip for the column header in this case? Just similiar to ListCtrol items, when we move mouse on any item, if the text is not fully shown, it will show a tooltip. But Now we want the similar behavior for the head column.
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