The HDN_ENDTRACK notification message notifies a header control's parent window that the user has finished dragging a divider. This notification message sent in the form of a WM_NOTIFY message.
HDN_ENDTRACK
phdn = (HD_NOTIFY FAR *) lParam;
Parameters
phdn
Pointer to an HD_NOTIFY structure that contains information about the header control and the item whose divider was dragged.
Return Values
No return value.
See Also