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Once you've added items to a header control, you can manipulate or get information about their order with the following functions:
CHeaderCtrl::GetOrderArray and CHeaderCtrl::SetOrderArray
Retrieves and sets the left-to-right order of header items.
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Retrieves the index value for a specific header item.
 
In addition to the previous member functions, the HDS_DRAGDROP style allows the user to drag and drop header items within the header control. For more information, see Providing Drag-and-Drop Support for Header Items.