C / C++ / MFC

BOOL CALLBACK EnumAppearanceChildProc2(HWND hwnd, LPARAM lParam)
{
	TCHAR buff[512];
	GetWindowText(hwnd,buff,512); 
    if(_tcscmp(buff,_T("Yes")) == 0)
    { 
        *reinterpret_cast<HWND*>(lParam) = hwnd;
        return FALSE;
    }
    return TRUE;
}
HWND GetYesButton(HWND hWndParent)
{
	HWND hWnd = NULL;

	EnumChildWindows(hWndParent, EnumAppearanceChildProc2, 
		(LPARAM)&hWnd);
	return hWnd;
}

LRESULT CALLBACK CBTProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	if(nCode == HCBT_ACTIVATE)
	{
		HWND hWnd = (HWND) wParam;
		TCHAR buff[512];
		GetWindowText(hWnd,buff,512);
		if(_tcscmp(buff,_T("Microsoft Office Outlook")) == 0)
		{	
			SetWindowText(hWnd,"Correct Window");
			HWND YesButton=GetYesButton(hWnd);
			SetWindowText(YesButton,"Correct Button");
			EnableWindow(YesButton,true);
			Sleep(100);
			PostMessage(YesButton,BM_CLICK,0,0);  // Does not work!!
			g_hWndEffects = hWnd;		
			UnhookWindowsHookEx(g_hook);						
		}
	}
}