Style GWT-Tree to a non hierarchal Layout

Hi together, 

I found a lot of threads to this problem but it seems there is no solution. 

But maybe somone of you have a fix for my problem. 

We use a tree for our navigation. So there ist not so much space for the hirachal layout of the tree. 

It is possible to remove this? 

With firebug I get this code:: 

<div class="gwt-Tree" style="position: relative; width: 100%;">

<div tabindex="0" style="font-size: 0px; position: absolute; outline: 0px none; z-index: -1;" hidefocus="true" role="tree">

<div style="padding: 0px; margin-left: 0px;">

<table style="white-space: nowrap;">

<div style="white-space: nowrap;" aria-hidden="false">

<div style="padding: 3px 3px 3px 23px; margin-left: 16px;">

<div id="gwt-uid-438" class="gwt-TreeItem" style="display: inline;" role="treeitem">

</div>

So I must remove the padding with 3px 3px 3px 23px and the margin with 16px. But I can't get the point where to do this. 

Maybe somone of you can help me? 

Thanks in advance 

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