Clipping Regions and border

{SOLVED: found another option SM_C(X/Y)(FIXED/SIZE)FRAME}Hi. I'm trying to create a Clock Application and I'm clipping my window in a circle. But somehow, 1 pixel row of the caption and pixel coloumn of the left border is NOT being clipped out. What am I doing wrong here?
I obtained the caption height, border height & border width from GetSystemMetrics() (SM_CYCAPTION, SM_CYEDGE, SM_CXEDGE).
But SM_C(X/Y)EDGE gives me a value of 2 while acually my border is 3 pixels wide (WS_EX_WINDOWEDGE style). This is why my caption and left border are showing.
Is there some other SM_C(X/Y) value which will give me the correct border width?

P.S. I tried substituting SM_C(X/Y)BORDER instead of EDGE. But It gives a value of 1 rather than 2 or 3 !

P.S. Yes, this can be rectified by simply adding a '+1' to the values but then I would be hard coding the values which i'm trying to avoid.
Heres' the simplified code strped to bare minimum(?):

Code:

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#include<windows.h>
#include"../clock/res.h"

LRESULT CALLBACK MainProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){

switch(Msg){

    case WM_CREATE:
    {
        int border_width  = GetSystemMetrics(SM_CXEDGE),
            border_height = GetSystemMetrics(SM_CYEDGE),
            title_height  = GetSystemMetrics(SM_CYCAPTION);

        HRGN hRgn = CreateEllipticRgn(0, 0, 200, 200);
        OffsetRgn(hRgn, border_width, title_height + border_width);

        if( !hRgn )
            break;

        SetWindowRgn(hWnd, hRgn, TRUE);
        DeleteObject(hRgn);

    }
    break;

    case WM_DESTROY:
    {
        PostQuitMessage(0);
    }
    break;
}
return DefWindowProc(hWnd, Msg, wParam, lParam);
}

int WINAPI WinMain(
                  HINSTANCE hInst,
                  HINSTANCE hPrev,
                  LPSTR lpCmdLine,
                  int nCmdShow
                  )
{
    WNDCLASSEX WndCls;

    WndCls.cbSize = sizeof(WNDCLASSEX);
    WndCls.style  = 0;
    WndCls.lpfnWndProc = MainProc;
    WndCls.cbClsExtra  = 0;
    WndCls.cbWndExtra  = 0;
    WndCls.hInstance  = hInst;
    WndCls.hIcon  = LoadIcon(hInst, MAKEINTRESOURCE(IDI_ICONSM));
    WndCls.hIconSm = LoadIcon(hInst, MAKEINTRESOURCE(IDI_ICONSM));
    WndCls.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndCls.hbrBackground = HBRUSH( COLOR_DESKTOP + 1);
    WndCls.lpszMenuName  = NULL;
    WndCls.lpszClassName = "MainClass";

    if( !RegisterClassEx(&WndCls) ){
        MessageBox(NULL, "Error Registering Class", "Exiting...", MB_OK);
        return 1;
    }

    HWND hWnd = CreateWindowEx(WS_EX_WINDOWEDGE, "MainClass", "Clock",
                              WS_SYSMENU | WS_MINIMIZEBOX,
                              0, 0, //CW_USEDEFAULT, CW_USEDEFAULT,
                              210, 250,
                              NULL, NULL, hInst, NULL);

    if( !hWnd ){
        MessageBox(NULL, "Error Creating Window", "Exiting...", MB_OK);
        return 1;
    }

    ShowWindow(hWnd, SW_SHOW);

    MSG Msg;

    while( GetMessage(&Msg, NULL, 0, 0) > 0 ){
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }

    return 0;
}

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The caption & border are seen as yellow below:
Attachment 6711