This(below) is how we specify the portlet region in a portal page, seems like we can only specify <region>center</region>, <region>left</region>, I wonder if I want to devide the page further into smaller region, how can I do that? For exampl,e instead of having only 2 columns portlet on page, I want to have 3 columns(I tried sepcify <region>right</region> and it doesn't work).

Any advice?

<window>
<window-name>Pentaho News</window-name>
<instance-ref>PentahoNews</instance-ref>
<region>center</region>
<height>0</height>
</window>
<window>
<window-name>Pentaho Intro</window-name>
<instance-ref>PentahoIntro</instance-ref>
<region>left</region>
<height>0</height>
</window>
<window>
<window-name>UserPortletWindow</window-name>
<instance-ref>UserPortletInstance</instance-ref>
<region>left</region>
<height>1</height>
</window>


Thanks,

yan