#include <Extras\WM_NOTIFY.au3>
#include <GUIConstantsEx.au3>
#include <GuiHeader.au3>
#include <MsgBoxConstants.au3>
#include <WindowsConstants.au3>

Global $g_hHeader

Example()

Func Example()
        ; Create GUI
        Local $hGUI = GUICreate("Header Destroy (v" & @AutoItVersion & ")", 400, 300)
        $g_hHeader = _GUICtrlHeader_Create($hGUI)
        _GUICtrlHeader_SetUnicodeFormat($g_hHeader, True)
        GUISetState(@SW_SHOW)

        _WM_NOTIFY_Register()

        ; Add columns
        _GUICtrlHeader_AddItem($g_hHeader, "Column 0", 100)
        _GUICtrlHeader_AddItem($g_hHeader, "Column 1", 100)
        _GUICtrlHeader_AddItem($g_hHeader, "Column 2", 100)
        _GUICtrlHeader_AddItem($g_hHeader, "Column 3", 100)

        ; Clear all filters
        _GUICtrlHeader_ClearFilterAll($g_hHeader)

        MsgBox($MB_SYSTEMMODAL, "Information", "About to Destroy Header")

        _GUICtrlHeader_Destroy($g_hHeader)

        ; Loop until the user exits.
        Do
        Until GUIGetMsg() = $GUI_EVENT_CLOSE
EndFunc   ;==>Example

Func WM_NOTIFY($hWnd, $iMsg, $wParam, $lParam)
        #forceref $hWnd, $iMsg, $wParam
        Local $tNMHDR = DllStructCreate($tagNMHDR, $lParam)
        Local $hWndFrom = HWnd(DllStructGetData($tNMHDR, "hWndFrom"))
        Local $iCode = DllStructGetData($tNMHDR, "Code")
        Switch $hWndFrom
                Case $g_hHeader
                        Switch $iCode
                                Case $HDN_BEGINDRAG ; Sent by a header control when a drag operation has begun on one of its items
                                        _WM_NOTIFY_DebugEvent("$HDN_BEGINDRAG", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        Return False ; To allow the header control to automatically manage drag-and-drop operations
                                        ; Return True  ; To indicate external (manual) drag-and-drop management allows the owner of the
                                        ; control to provide custom services as part of the drag-and-drop process
                                Case $HDN_BEGINTRACK, $HDN_BEGINTRACKW ; Notifies a header control's parent window that the user has begun dragging a divider in the control
                                        _WM_NOTIFY_DebugEvent("$HDN_BEGINTRACK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        Return False ; To allow tracking of the divider
                                        ; Return True  ; To prevent tracking
                                Case $HDN_DIVIDERDBLCLICK, $HDN_DIVIDERDBLCLICKW ; Notifies a header control's parent window that the user double-clicked the divider area of the control
                                        _WM_NOTIFY_DebugEvent("$HDN_DIVIDERDBLCLICK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_ENDDRAG ; Sent by a header control when a drag operation has ended on one of its items
                                        _WM_NOTIFY_DebugEvent("$HDN_ENDDRAG", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        Return False ; To allow the control to automatically place and reorder the item
                                        ; Return True  ; To prevent the item from being placed
                                Case $HDN_ENDTRACK, $HDN_ENDTRACKW ; Notifies a header control's parent window that the user has finished dragging a divider
                                        _WM_NOTIFY_DebugEvent("$HDN_ENDTRACK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_FILTERBTNCLICK ; Notifies the header control's parent window when the filter button is clicked or in response to an $HDM_SETITEM message
                                        _WM_NOTIFY_DebugEvent("$HDN_FILTERBTNCLICK", $tagNMHDFILTERBTNCLICK, $lParam, "IDFrom,,Item,Left,Top,Right,Bottom")
                                        ; Return True  ; An $HDN_FILTERCHANGE notification will be sent to the header control's parent window
                                        ; This notification gives the parent window an opportunity to synchronize its user interface elements
                                        Return False ; If you do not want the notification sent
                                Case $HDN_FILTERCHANGE ; Notifies the header control's parent window that the attributes of a header control filter are being changed or edited
                                        _WM_NOTIFY_DebugEvent("$HDN_FILTERCHANGE", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_GETDISPINFO, $HDN_GETDISPINFOW ; Sent to the owner of a header control when the control needs information about a callback header item
                                        _WM_NOTIFY_DebugEvent("$HDN_GETDISPINFO", $tagNMHDDISPINFO, $lParam, "IDFrom,Item")
                                        ; Return LRESULT
                                Case $HDN_ITEMCHANGED, $HDN_ITEMCHANGEDW ; Notifies a header control's parent window that the attributes of a header item have changed
                                        _WM_NOTIFY_DebugEvent("$HDN_ITEMCHANGED", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_ITEMCHANGING, $HDN_ITEMCHANGINGW ; Notifies a header control's parent window that the attributes of a header item are about to change
                                        _WM_NOTIFY_DebugEvent("$HDN_ITEMCHANGING", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        Return False ; To allow the changes
                                        ; Return True  ; To prevent them
                                Case $HDN_ITEMCLICK, $HDN_ITEMCLICKW ; Notifies a header control's parent window that the user clicked the control
                                        _WM_NOTIFY_DebugEvent("$HDN_ITEMCLICK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_ITEMDBLCLICK, $HDN_ITEMDBLCLICKW ; Notifies a header control's parent window that the user double-clicked the control
                                        _WM_NOTIFY_DebugEvent("$HDN_ITEMDBLCLICK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        ; no return value
                                Case $HDN_TRACK, $HDN_TRACKW ; Notifies a header control's parent window that the user is dragging a divider in the header control
                                        _WM_NOTIFY_DebugEvent("$HDN_TRACK", $tagNMHEADER, $lParam, "IDFrom,,Item,Button")
                                        Return False ; To continue tracking the divider
                                        ; Return True  ; To end tracking
                        EndSwitch
        EndSwitch
        Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_NOTIFY