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@Inject
private Request request;

@InjectComponent
private Zone myZone;
...
Object onClickFromSomeLinkonActionFromSomeLink()
{
   return myZone.getBody(); // AJAX request, return zone's own body
} 

@Inject
private Request request;

@InjectComponent
private Zone myZone;
...
Object onClickFromSomeLinkonActionFromSomeLink()
{
    // return either the zone body (ajax) or whole page (non-ajax)
    return request.isXHR() ? myZone.getBody() : null;
}