Android : Libx GDX scrollable with overlay

I quite new to libGDX and trying to Implement the layout shown in the picture below using the table layout

The container a Table [Green] is composed of a Table Header and of a ScrollPane body. the body is also a table with various rows.

I am trying to have the body part that is scrolling under the Header and the beginning the body1 should be visible with a proper padding from top.

The code so far:

ScrollPane body = new ScrollPane(bodyTable);
header.add(headerBar).expandX().fillX();    
container.add(header).top().expandX().fillX().row();
container.add(body).fill().expand();

It can scroll properly but there is no overlap between header body. Wonder is this is possible using tables ?Is there any example / suggestion that can point me in the right direction ?

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