Вот пример кода для SplitLayoutPanel,
<g:SplitLayoutPanel>
<g:west size="200">
<g:VerticalPanel />
</g:west>
<g:center>
<g:VerticalPanel />
</g:center>
<g:south size="200">
<g:VerticalPanel />
</g:south>
<g:north size="200">
<g:VerticalPanel />
</g:north>
</g:SplitLayoutPanel>
Спасибо,
Gnik