As the mouse cursor is positioned above any cell of an item in the tree control, the cell in the first displayed column can be shown underlined. Flyby highlighting can be enabled using SFTTREE_CONTROL, iFlybyStyle.

If a selection style is used that uses a rounded outline rectangle with a gradient fill, the cell text is not underlined. Instead, a rounded outline rectangle with a gradient fill is used to highlight the item, based on the current selection style (see GetSelectionStyle).

Flyby highlighting helps users easily identify where the mouse cursor is located in a multi-column tree control.