Exporting Instance Methods to Hand-Written Javascript

I have a piece of GWT code that I wanted to invoke from outside handwritten JavaScript. There's an example shown here under "Calling a Java method from Handwritten JavaScript":

https://developers.google.com/web-toolkit/doc/latest/DevGuideCodingBasicsJSNI

That example uses a static method; I can make that work, but my first instinct was that i'd rather use an instance, so using the syntax shown under JSNI invocations, I tried:

/* package */ native void exportJavascriptMethods( PreviewPane x ) /*-{
       $wnd.imageSelected =
          $entry(this@ca.cpp.spike.gwtapplet.client.PreviewPane::imageSelected(Ljava/lang/String;Ljava/lang/String;));
  }-*/;

That doesn't work. Eclipse (and the GWT compiler) complain:

"JavaScript parsing: Missing ) after argument list PreviewPane.java"

If I replace 'this' with 'x', same problem. If I take 'this' out and leave it binding to the static method:

/* package */ native void exportJavascriptMethods( PreviewPane x ) /*-{
       $wnd.imageSelected =
          $entry(@ca.cpp.spike.gwtapplet.client.PreviewPane::imageSelected(Ljava/lang/String;Ljava/lang/String;));
  }-*/;

All is well in the world.

So -- is that just not an option, exporting an instance method like that?

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