Annotated timeline container size

I get this error when I try to add an annotated timeline to a simple
test application, exactly which container are we talking about here ?
Isn't the SimplePanel the container of the widget, and that one
certainly has a fixed size.

com.google.gwt.core.client.JavaScriptException: (Error): Container
height is zero. Expecting a valid height.
fileName: http://www.google.com/uds/api/visualization/1.0/03537a5e2d997d1731ec06c75629ba9e/default,annotatedtimeline+en_US.I.js

public class Test implements EntryPoint {
public void onModuleLoad() {
final SimplePanel p = new SimplePanel();
VisualizationUtils.loadVisualizationApi(new Runnable() {
@Override
public void run() {
AnnotatedTimeLine t = new AnnotatedTimeLine("800",
"500");
DataTable data = DataTable.create();

p.setHeight("300");
p.setWidth("500");
p.add(t);

t.draw(data);
}
}, AnnotatedTimeLine.PACKAGE);

RootPanel.get().add(p);
}
}

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