You have to make sure that you directly call Window.open() in the 
ClickHandler. Don't to it in a Timer, deferred command or similar inside 
the ClickHandler. The Browser must recognize that Window.open() is directly 
called because of a user action. It does not matter if its a Button or an 
Anchor.
Also don't do Window.open() somewhere deep in a sub function called inside 
the ClickHandler.

Something like the following will work:

Button b = new Button("Test");
b.addClickHandler(new ClickHandler() {
  void onClick(ClickEvent e) {
    Window.open("http://www.google.de";, "_blank", "");
  }
});

If you wrap Window.open() for example in a Timer it won't work anymore.

-- J.

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