Adding Grid with margin to a LayoutPanel

[hermis]

Hey all,

When I add a grid with 100% height to a layout panel and set a margin on it, the bottom margin is not honoured:

public void onModuleLoad() 

{
Grid grid = new Grid(1,1);
grid.setHeight("100%");
grid.getElement().getStyle().setBackgroundColor("yellow");
grid.getElement().getStyle().setMargin(10, Unit.PX);

LayoutPanel lp = new LayoutPanel();
lp.add( grid );

RootLayoutPanel.get().add( lp );

}

How can I fix this?

Thanks in advance.