关于toolbar的有关问题

关于toolbar的问题
两种create   toolbar的方法:toolbar自己的数据结构是怎样的?能否将每一个button对应的image分别load进toolbar?
1
Create   a   toolbar   resource.  
Construct   the   CToolBar   object.  
Call   the   Create   (or   CreateEx)   function   to   create   the   Windows   toolbar   and   attach   it   to   the   CToolBar   object.  
Call   LoadToolBar   to   load   the   toolbar   resource.  
Otherwise,   follow   these   steps:  
2
Construct   the   CToolBar   object.  
Call   the   Create   (or   CreateEx)   function   to   create   the   Windows   toolbar   and   attach   it   to   the   CToolBar   object.  
Call   LoadBitmap   to   load   the   bitmap   that   contains   the   toolbar   button   images.  
Call   SetButtons   to   set   the   button   style   and   associate   each   button   with   an   image   in   the   bitmap.  
另外,vs.studio默认生成的一段代码:
if   (!m_wndToolBar.CreateEx(this,   TBSTYLE_FLAT,   WS_CHILD   |   WS_VISIBLE   |   CBRS_TOP
|   CBRS_GRIPPER   |   CBRS_TOOLTIPS   |   CBRS_FLYBY   |   CBRS_SIZE_DYNAMIC)   ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
最后的LoadToolBar(IDR_MAINFRAME)在参数中怎么起作用的?

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