javascript call to java method doesn´t work in developing mode - but when code is compiled (GWT 2.51)

If have a Class that looks similar like this:

public class MyClass extends Widget {
      public MyClass() {          declareMethod(this);      }        //Method which declares non-static method in javascript      public native void declareMethod(MyClass this) /*-{          var _this = this;          $wnd.doSomething = function(someString) {              _this.@com.example.MyClass::doSomething(Ljava/lang/String;)(someString);          }      }-*/;  }

Within the javascript code I call

window.doSomething("hello");


This works fine when I compile the code and start the generated code.
But works not when I try this in development mode against the plugin within the browser.

Any ideas or similar experience ?

I´m running eclipse  Juno with GWT 2.5.1

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