public void addWidget(Widget w) {
        if (w == null || controlGroup == null) return;
        controlGroup.add(w);
    }
public void addWidget ( Widget w ) { if ( w == null || controlGroup == null ) return ; controlGroup . add ( w ) ; }
Currently possible only in checkBox and control group modes.
<p>See {@link JQMListItem#setCheckBox(IconPos)} and {@link JQMListItem#setControlGroup(boolean)}