Does it work in fire fox or any other browser?
There is height and width property for rich:modalPanel but as far as I know you can not specify it in % .
BTW do you reall need height in %?
for more details refer to demo site
I'm Talking about normal Panel
But now I tried rich panel by setting the height in %
<rich:panel style="height : 100%" id="addressPanel">
and It's working good it goes to fullest height without depending on the contents inside.
rich:panel is a simple div. use firebug for testing such cases and use the same approaches as you used for div elements.
the wierd thing that % worked with jsp pages but when i'm using it with Xhtml pages it doesn't work :S