MFC support in ATL project

Hi all, I've done an ATL project but now I have to add a slider and the only way to add it (that I know) is to add to the STDAFX.H this:

Code:

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#include <afxwin.h>        // MFC core and standard components
#include <afxext.h>        // MFC extensions
#include <afxdisp.h>        // MFC Automation classes
#include <afxdtctl.h>                // MFC support for Internet Explorer 4 Common Controls
#ifndef _AFX_NO_AFXCMN_SUPPORT
#include <afxcmn.h>                        // MFC support for Windows Common Controls
#endif // _AFX_NO_AFXCMN_SUPPORT

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But I receive this fatal error:

Compiling...
stdafx.cpp
C:\Programs\Microsoft Visual Studio 8\VC\atlmfc\include\afxv_w32.h(16) : fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h>

I've searched on google but every way I've tried had no effects.

Need help :(

FIXED

For the interested ppl, use CTrackBarCtrl instead of CSliderCtrl

Btw, someone has some hints about the:

Code:

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void MakeTransparent()

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I've defined as this:

Code:

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void MakeTransparent(HWND hWnd, int value, COLORREF *color) {...}

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but I need only to have the main window transparent not a ghost, I dunno why the main window is only a ghost in fact if I have under it notepad opened I write on notepad and the the main window switch in background!