WTL, MDI and Toolbars

Using the Windows Template Library wizard, I get a a CommandBar and a ToolBar for an MDI application. The CommandBar changes automatically depending on which MDI Child has the focus. How do I get the toolbar to do the same? e.g. if I create multiple toolbars, where should I be placing code to switch between the different toolbars? or I can use a single toolbar and automatically hide/show buttons ?

Thanks