在OnCreate中调用DwmExtendFrameIntoClientArea的方法

WTL中CMainFrame类里面OnCreate函数的模板:

LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
// create command bar window
HWND hWndCmdBar = m_CmdBar.Create(m_hWnd, rcDefault, NULL, ATL_SIMPLE_CMDBAR_PANE_STYLE);
// attach menu
m_CmdBar.AttachMenu(GetMenu());
// load command bar images
m_CmdBar.LoadImages(IDR_MAINFRAME);
// remove old menu
SetMenu(NULL);

HWND hWndToolBar = CreateSimpleToolBarCtrl(m_hWnd, IDR_MAINFRAME, FALSE, ATL_SIMPLE_TOOLBAR_PANE_STYLE);

CreateSimpleReBar(ATL_SIMPLE_REBAR_NOBORDER_STYLE);
AddSimpleReBarBand(hWndCmdBar);
AddSimpleReBarBand(hWndToolBar, NULL, TRUE);

CreateSimpleStatusBar();

m_hWndClient = m_view.Create(m_hWnd, rcDefault, NULL, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, WS_EX_CLIENTEDGE);

UIAddToolBar(hWndToolBar);
UISetCheck(ID_VIEW_TOOLBAR, 1);
UISetCheck(ID_VIEW_STATUS_BAR, 1);

// register object for message filtering and idle updates
CMessageLoop* pLoop = _Module.GetMessageLoop();
ATLASSERT(pLoop != NULL);
pLoop->AddMessageFilter(this);
pLoop->AddIdleHandler(this);
return 0;

}

LRESULT OnFileExit(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
PostMessage(WM_CLOSE);
return 0;
}

LRESULT OnFileNew(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
// TODO: add code to initialize document

return 0;
}

LRESULT OnViewToolBar(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
static BOOL bVisible = TRUE;// initially visible
bVisible = !bVisible;
CReBarCtrl rebar = m_hWndToolBar;
int nBandIndex = rebar.IdToIndex(ATL_IDW_BAND_FIRST + 1);// toolbar is 2nd added band
rebar.ShowBand(nBandIndex, bVisible);
UISetCheck(ID_VIEW_TOOLBAR, bVisible);
UpdateLayout();
return 0;
}
一篇文章中（http://dev.yesky.com/117/2640117.shtml
http://dev.yesky.com/117/2640117_1.shtml）
提到:

通过把毛玻璃效果从非客户区扩展到客户区，就可完成添加程序的毛玻璃效果，这个API是DwmExtendFrameIntoClientArea()。DwmExtendFrameIntoClientArea()接受两个参数：我们框架窗口的HWND和一个用于说明毛玻璃效果扩展到窗口四周多远的MARGINS结构。可在OnCreate()中调用这个API：
LRESULT CMainFrame::OnCreate(LPCREATESTRUCT lpcs)
{
//在底部添加玻璃效果
MARGINS mar = {0};
mar.cyBottomHeight = 100;
DwmExtendFrameIntoClientArea ( m_hWnd, &mar );
return 0;
}
但具体怎么改,是在OnCreate定义时候改,还是在主函数WINAPI _tWinMain里面调用,具体怎么改.
...特此请教