Placing footer on the bottom of the region-area

Hello,
I'm a newbie with xsl-fo so I would need some help.
I am trying to position my footer content aligned on the bottom of my region-after area. I'm using the display-align attribut initialized at "after". Here is the code:

<fo:simple-page-master master-name="first" page-height="29.7cm" page-width="21.0cm" margin-top="0.5cm" margin-bottom="0.5cm" margin-left="0.5cm" margin-right="0.5cm">

<fo:region-body margin-top="0cm" margin-bottom="1.5cm"/>
<fo:region-before extent="1cm" region-name="before-first"/>
<fo:region-after extent="3.5cm" display-align="after" background-color="#BBB34F" region-name="after-first" />
</fo:simple-page-master>

Here I place a static content for the region-after area

<fo:static-content flow-name="after-first">
<xsl:call-template name="show-footer" />
</fo:static-content>

Suposing the template show-footer looks like this (no need to bother you with the whole code, it doesn't work eaven with this simple one):


<xsl:template name="show-footer">

<fo:table>
<fo:table-column column-width="18.5cm" />
<fo:table-body>
<fo:table-row>
<fo:table-cell height="3.5" background-color="#CCCCCC">
<fo:block>
test
</fo:block>
</fo:table-cell>
</fo:table-row>
</fo:table-body>
</fo:table>

</xsl:template>

I'm not using a stylesheet so it ain't a problem of override.

Thanks for any kind of help