Write an OnSectionDrag event handler to respond when a user tries to reorder the sections in the header control. The OnSectionDrag event handler can conditionally prevent the user from dragging a header to a new position. 

If the AllowDrag parameter is true on exit from the event handler, the header control reorders the sections and generates an OnSectionEndDrag event when the reorder is complete. 

OnSectionDrag only occurs if the DragReorder property is true. 

DragReorder 

Sections 

OnSectionEndDrag