Sets whether the control is flat
#include <GuiToolbar.au3>
_GUICtrlToolbar_SetStyleFlat ( $hWnd, $bState )
| $hWnd | Handle to the control | 
| $bState | True to set, false to unset | 
| Success: | True. | 
| Failure: | False. | 
#include <GUIConstantsEx.au3>
#include <GuiToolbar.au3>
#include <MsgBoxConstants.au3>
#include <WinAPIConstants.au3>
Example()
Func Example()
    Local $hGUI, $hToolbar, $bStyle
    Local Enum $e_idNew = 1000, $e_idOpen, $e_idSave, $e_idHelp
    ; Create GUI
    $hGUI = GUICreate("Toolbar", 400, 300)
    $hToolbar = _GUICtrlToolbar_Create($hGUI)
    GUISetState(@SW_SHOW)
    ; Add standard system bitmaps
    Switch _GUICtrlToolbar_GetBitmapFlags($hToolbar)
        Case 0
            _GUICtrlToolbar_AddBitmap($hToolbar, 1, -1, $IDB_STD_SMALL_COLOR)
        Case 2
            _GUICtrlToolbar_AddBitmap($hToolbar, 1, -1, $IDB_STD_LARGE_COLOR)
    EndSwitch
    ; Add buttons
    _GUICtrlToolbar_AddButton($hToolbar, $e_idNew, $STD_FILENEW)
    _GUICtrlToolbar_AddButton($hToolbar, $e_idOpen, $STD_FILEOPEN)
    _GUICtrlToolbar_AddButton($hToolbar, $e_idSave, $STD_FILESAVE)
    _GUICtrlToolbar_AddButtonSep($hToolbar)
    _GUICtrlToolbar_AddButton($hToolbar, $e_idHelp, $STD_HELP)
    ; Change control style
    $bStyle = _GUICtrlToolbar_GetStyleFlat($hToolbar)
    MsgBox($MB_SYSTEMMODAL, "Information", "Toolbar has flat style .: " & $bStyle)
    GUISetState(@SW_LOCK)
    _GUICtrlToolbar_SetStyleFlat($hToolbar, Not $bStyle)
    GUISetState(@SW_UNLOCK)
    MsgBox($MB_SYSTEMMODAL, "Information", "Toolbar has flat style .: " & _GUICtrlToolbar_GetStyleFlat($hToolbar))
    ; Loop until the user exits.
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
EndFunc   ;==>Example