How to detect removed element in GWT

In my application, I have such following code:

public class Application {

    private Element oneElement = null;

    public Application(Document document) {

          oneElement = document.getElementById("org");

    }

    public boolean hasParent() {

          Element parentElement = oneElement.getParentElement();

          return (parentElement != null);

    }

}

In my code, I got oneElement in one constructor. Later, when Application.hasParent() is called, it returns true although this element was removed by running Element.removeFromParent() in another Class. Aparently oneElement is orphan. In GWT, how do I detect orphan elements like oneElement.

Thanks,

David

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