if (frameSet == null) return null;
    protected Object getInheritedValue(Frame origin, String slot)    {	Object result = super.getInheritedValue(origin, slot);	if (result != null) return result;	Frame parent = frameSet.getParent(this);	if (parent != null) {	    return parent.getValue(slot);	} else {	    return null;	}    }