How to set ToolTip for TextHeader in GWT?

I got a TextHeader & I want when user mouses over it a small tooltip will pop up.

    TextHeader deleteHeader=new TextHeader("");             deleteHeader.setUpdater(new ValueUpdater<String>(){                @Override              public void update(String value) {                  // can't get getAbsoluteLeft() & getAbsoluteTop() of TextHeader here                }         });  

The problem is I can't get getAbsoluteLeft() & getAbsoluteTop() of TextHeader to solve it.

Can you find a simple solution for this? 

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