In my Seam application that I am working on I make heavy use of Javascript for the UI; specifically I use ExtJS for the front end.  When I invoke a Seam Component from within a Javascript object instance the scope of that call is lost in the callback.  As an example:

MyJSClass = {

  x: 'Hello',

  someFunction: function() {
    this.x = this.x + ', World!';
    Seam.Components
      .getInstance('someComponent')
      .someMethod(arg, this.callback);
  },

  callback: function(response) {
    alert(this.x + response);
  }

};

The scope of this.x does not point to the object from the call.  Is there a way to add an optional argument to the Component's method invocation where we can set the scope?  Someting like:

    Seam.Components
      .getInstance('someComponent')
      .someMethod(arg, this.callback, this);

and have Seam use this scope when invoking the callback?

Thanks,
  Colin