I'm doing it like this:
<xsl:variable name="level" select="count(ancestor::Menu)"/>
(...)
<xsl:choose>
<xsl:when test="$level=0">
<xsl:text>1</xsl:text> ----> this node is visible
</xsl:when>
where Menu is your tree_node.
that (probably) forces the system to really go all the way up the
ancestor axis and count the number of nodes.
If you just went
<xsl:when test="not(ancestor::Menu)">1</xsl:when>
then the system would only need to do the minimum amount of checking to
see if there were any such ancestors.
David
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