How to implement shortcut menus

Hello,

Our application has several different kinds of child windows -- a graph, a spreadsheet, a text editor, etc.
Can we use some kind of CommandBar to implement a shortcut menu for each window?  How do we activate the menu (presumably from the WM_RBUTTONDOWN handler for the window)?

Thanks for any advice or pointers to articles/samples/tutorials...

It looks like all the samples create the popup menu/commandbar at the time it is needed.

Two questions:
-- What happens when this is done multiple times?  Are duplicate items ignored?

-- I would like to create my context menus at startup, then display them in the specific event handler.  It's not clear how to find/retrieve the correct commandbar/popup object.
For example, if I do something like this:
    ICommandBarPtr  pPopup = 0;
    pPopup = g_spCommandBars->Add("MapperPopup", xtpBarPopup);
    pControls = pPopup->GetControls();
    // add controls...

If all that happens in the event handler for the right mouse click, this
    pPopup->ShowPopup();
works as expected.

Thanks for any pointers...