Parameters
- mergedHeadersCount
- The number of merged column headers present in the datagrid.
By default, a grid contains a GroupByControl and a ColumnManagerRow in its FixedHeaders that are added before any other elements that are explicitly added to the section.
Target Platforms: Windows 11, Windows, 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2