By default, the 
icon should be displayed in the main column header so the user can know which is the default order.
This icon should also be displayed on hover, to explicit what will occur on click.
Last (but not least), there is no reason to hide the icon after 3 clicks on a column header.
By default, the
icon should be displayed in the main column header so the user can know which is the default order.
This icon should also be displayed on hover, to explicit what will occur on click.
Last (but not least), there is no reason to hide the icon after 3 clicks on a column header.