@Override
   public void execute(ICustomContext context) {
       PictogramElement[] elms = context.getPictogramElements();
       if (elms == null || elms.length != 1) return;

       String val = pes.getPropertyValue(elms[0], LOC_ELEMENT);
       if (val == null) return;

       Shape outer = (Shape)elms[0];
       if (val.equals(NAME)) {
           outer = outer.getContainer();
       } else if (!val.equals(OUTER)) {
           return;
       }

       .... // Use outer as the shape to work on.

    @Override
    public IContextButtonPadData getContextButtonPad(IPictogramElementContext context)
    {
        IContextButtonPadData data = super.getContextButtonPad(context);
        if (data == null) return null;

        PictogramElement pe = context.getPictogramElement();
        String val = pes.getPropertyValue(pe, LOC_ELEMENT);
        if (val == null || !val.equals(OUTER)) return data;

        // XXX Here I can do the shape trick like above, to make "pe" always point to the OUTER shape.

        setGenericContextButtons(data, pe,
                                 CONTEXT_BUTTON_DELETE | CONTEXT_BUTTON_UPDATE);

        // Initial state toggle context button.
        CustomContext cc;
        cc = new CustomContext(new PictogramElement[] {pe});
        IContextButtonEntry initialCbe = null;
        IContextButtonEntry markedCbe = null;
        ICustomFeature[] cfs = getFeatureProvider().getCustomFeatures(cc);
        for (int i = 0; i < cfs.length; i++) {
            ICustomFeature cf = cfs[i];
            if (cf instanceof LocationInitialToggleFeature) {
                initialCbe = new ContextButtonEntry(cf, cc);
                continue;
            }
            if (cf instanceof LocationMarkerToggleFeature) {
                markedCbe = new ContextButtonEntry(cf, cc);
                continue;
            }
        }

        // XXX But here the custom features get added to the original context through 'data'.
        // XXX If that context is a NAME, it has no chopbox anchor, so the engine cannot
        // XXX draw the context buttons at the right place.

        List<IContextButtonEntry> cbs = data.getDomainSpecificContextButtons();
        if (initialCbe != null) cbs.add(initialCbe);
        if (markedCbe != null) cbs.add(markedCbe);

        return data;
    }