public boolean equals(Object obj) {
        
        if (obj == this) { // simple case
            return true;
        }      
        // now try to reject equality...
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof XYDrawableAnnotation)) {
            return false;
        }
        XYDrawableAnnotation that = (XYDrawableAnnotation) obj;
        if (this.x != that.x) {
            return false;
        }
        if (this.y != that.y) {
            return false;
        }
        if (this.width != that.width) {
            return false;
        }
        if (this.height != that.height) {
            return false;
        }
        if (!ObjectUtilities.equal(this.drawable, that.drawable)) {
            return false;
        }
        // seem to be the same... 
        return true;
        
    }