Layoutpanel and unused space on right side

[gvorsterman]

When I use this layout:

 <rich:layout style="background-color:#ffffff; border:0px solid">
 <rich:layoutPanel position="top">
 <div style="border: 1px solid; height: 103px; background-color: #ffffff;">
 top
 </div>
 </rich:layoutPanel>

 <rich:layoutPanel position="left" width="20%">
 <div style="border: 1px solid;">
 left
 </div>
 </rich:layoutPanel>

 <rich:layoutPanel position="center" width="80%">
 <div style="border: 1px solid">
 center
 </div>
 </rich:layoutPanel>

 </rich:layout>

I see this: http://www.rldev.net/temp/layout.jpg


How can I make the "center" use the complete right side?
Now there is a some unused space on the right side.

regards
Guus