Retrieves the display rectangle of the client area
#include <GuiTab.au3>
_GUICtrlTab_GetDisplayRect ( $hWnd )
| $hWnd | Handle to the control | 
Use this function to obtain the coordinates, in pixels, of the portion of the tab control that represents the contents of the tab pages.
The appearance of this portion of the tab control does not change when different tabs are selected.
#include "Extras\HelpFileInternals.au3"
#include <GUIConstantsEx.au3>
#include <GuiTab.au3>
#include <MsgBoxConstants.au3>
Example()
Func Example()
    ; Create GUI
    Local $hGUI = GUICreate("Tab Control Get Display Rect (v" & @AutoItVersion & ")", 450, 300, 100, 100)
    Local $idTab = GUICtrlCreateTab(2, 2, 446, 266)
    _MemoMsgBoxStatus() ; Status creation
    GUISetState(@SW_SHOW)
    ; Add tabs
    _GUICtrlTab_InsertItem($idTab, 0, "Tab 0")
    _GUICtrlTab_InsertItem($idTab, 1, "Tab 1")
    _GUICtrlTab_InsertItem($idTab, 2, "Tab 2")
    ; Get display rectangle
    Local $aRect = _GUICtrlTab_GetDisplayRect(GUICtrlGetHandle($idTab))
    Local $sRect = StringFormat("[%d, %d, %d, %d]", $aRect[0], $aRect[1], $aRect[2], $aRect[3])
    _MemoMsgBox($MB_SYSTEMMODAL, "Information", "Display rectangle: " & $sRect)
    _MemoMsgBoxStatus("", -1, $hGUI) ; no more action, wait GUI for closing
EndFunc   ;==>Example