Moving content to the last column

[Chris Pratt]

I have a multi-columnar display, where I need some content to end up in the last column on the page.  What would be perfect would be the ability to specify a <fo:block break-before="last-column">, but that doesn't appear to be a valid value.  Alternatively a method in XPath to specify <xsl:if test="column() == last-column()"> would work as well.  Are these capabilities there, but I'm some how missing them?  Is there a different way to achieve the same desired effect?  Is there a way to add an extension that could do this?  Any help would be appreciated.  Thanks   (*Chris*)