Occurs when the DisplayIndex property on one of the columns changes.
Assembly: PresentationFramework (in PresentationFramework.dll)
The DisplayIndex property of a DataGridColumn can be changed programmatically or when a user moves a column by dragging the header. Users can change the column order by dragging column headers only if the CanUserReorderColumns property is true.
Available since 4.0
Available since 2.0