JSInterop extend JavaScript object

[confile]

Is there a way to extend a @JsType interface such that the new Java object has new properties and methods? I know that it is planned in future but is there also a posibility of doing it right now?

Here is how I do it for properties:

@JsType(prototype = "$wnd.Kinetic.Node")

public interface Node {

public static abstract class Statics {

public static native Node create() /*-{

return new $wnd.Kinetic.Node();

}-*/;

public static native void isLocked(Node node, boolean value) /*-{

node.isLocked = value;

}-*/;

public static native boolean isLocked(Node node) /*-{

return !!node.isLocked;

}-*/;

}

}