These are the only two references to IDR_PAGEBAR in the entire solution:

Code:
mainfrm.cpp(101, 29): !m_wndPageBar.LoadToolBar(IDR_PAGEBAR))
resource.h(110, 9): #define IDR_PAGEBAR                     310
And in mainfrm.cpp, it is set/loaded here:
Code:
	if (!m_wndPageBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
		!m_wndPageBar.LoadToolBar(IDR_PAGEBAR))
	{
		TRACE0("Failed to create page toolbar\n");
		return -1;      // fail to create
	}