tag suggestion

We need a <tab> tag. Why? because right now there's no way to actually make a 
tabbed pane with anything in it unless you render seperate xml files and shove 
them in the one that holds the tabbed pane, or add them manually...but we 
won't speak of such things. 



<tabbedpane>
    <tab title="foo">
      <some component here />
    </tab>
    <tab title="not foo">
      <some component here />
    </tab>
</tabbedpane>


-Kate