I discovered that there are cases when an icon may not be there in the
first place.
A better setIcon is the following
public void setIcon ( Image icon )
{
// make sure that any previous association of icon is gone.
icon.removeFromParent();
// get the element of this button
Element element = getElement();
// can this happen ???
if ( element == null ) return;
// get the icon that was associated with this element, if any
Node oldIcon = element.getFirstChild();
if ( oldIcon == null )
element.appendChild( icon.getElement());
else
element.replaceChild(icon.getElement(),oldIcon);
}
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