#include <GuiButton.au3>
#include <GuiConstantsEx.au3>
#include <StaticConstants.au3>
#include <WinAPITheme.au3>
#include <WindowsConstants.au3>

$hMainGUI = GUICreate ("Example", 300, 300)
GUISetBkColor (0xFFFFFF, $hMainGUI)
GUISetState (@SW_SHOW, $hMainGUI)

$iIconCount = _WinAPI_ExtractIconEx ("shell32.dll", -1, 0, 0, 0)
$tResIcons  = DllStructCreate ("HANDLE[" & $iIconCount & "]")
$pResIcons  = DllStructGetPtr ($tResIcons)
$iIconCount = _WinAPI_ExtractIconEx ("shell32.dll", 0, $pResIcons, 0, $iIconCount)

$idButton = GUICtrlCreateButton ("", 50, 50, 45, 45, $BS_ICON)
GUICtrlSetImage (-1, "shell32.dll", 16781)
$idIcon   = GUICtrlCreateIcon ("shell32.dll", 2, 50, 170, 45, 45)
GUICtrlSetImage (-1, "shell32.dll", 16780)

Sleep (1000)

; This works.
GUICtrlSendMsg ($idButton, $BM_SETIMAGE, $IMAGE_ICON, DllStructGetData ($tResIcons, 1, 297))
GUICtrlCreateLabel ("This works.", 50, 100)

Sleep (1000)

; Does not work.
GUICtrlSendMsg ($idIcon, $BM_SETIMAGE, $IMAGE_ICON, DllStructGetData ($tResIcons, 1, 297))
GUICtrlCreateLabel ("Does not work.", 50, 220)

For $i = 1 To $iIconCount
	_WinAPI_DestroyIcon (DllStructGetData ($tResIcons, 1, $i))
Next

While True
	$nMsg = GUIGetMsg ()
	If $nMsg = $GUI_EVENT_CLOSE Then Exit
WEnd