This property is useful to provide a visual boundary between frozen rows and rows that can scroll. The extra edge is part of the current row, although it will take on the foreground color of the associated DataGridView. The extra edge does not extend the area in which users can double-click to automatically resize a row. To resize a row, the user must double-click on the boundary between the divider and the adjacent row.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2