VerticalPanel differently rendered on FireFox and Chrome

[tanteanni]

if i add some stuff to a verticalPanel nested in a SimplLayoutPanel(100%h,100%w) the result is very different on different browsers:

chrome don't use the 100% and sticks all stuff in VP together. Firefox(6) and IE(6) use all the space to layout the stuff inside VP. Why does this happen? The main reason to chose gwt was to get rid of such problems. So if a table with 100%(i think that is the html translation of my VP) is rendered differntly, gwt should use a different translation to get same results, shouldn't it?

the other question is how to get the same result on all browsers - i want the result of chrome: all stuff should stick together vertically arranged.

thx in advance