> My question is how to ask the cart section to updates its
> state (and redraw it) from a child page?
Just add the superclass element to the AjaxRequetTarget parameter. This
means either holding a reference to it (e.g. a protected instance field)
or better, use get("path:to:cart") to get at it. Remember that all
elements that should be updated via Ajax needs to have called
setOutputMarkupId(true) on them so that the Javascript libraries can
adddress them.
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