Adding image to a cell of CellTree

Hi, i want to add an image to the cell's of a CellTree but i don't
know how to do it.
Thanks.

Cell<Cartella> cell = new AbstractCell<Cartella>("dblclick")
{

@Override
public void render(Context context, Cartella value, SafeHtmlBuilder
sb)
{
sb.appendEscaped(value.getDescCartella());
}
}

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