new window on button click shows "about:blank" url first then takes me to the url desired.

I am simply using a button in my entry point class as shown below and want to open a url in new window.

When I click on the button a new window opens up but before that window takes me to the url I want to, it shows me "about:blank" in the url part in that window for a second then opens that url.

I am not able to get why that is happening.It happens with any url I want to open and in all browsers.

Please suggest.

.......code segment start...

...   

Button button = new Button("Click Me!");

      button.addClickHandler(new MyClickHandler());

   ...

   }

   /** 

    * create a custom click handler which will call 

    * onClick method when button is clicked.

    */

   private class MyClickHandler implements ClickHandler {

      @Override

      public void onClick(ClickEvent event) {

     String url = "http://www.google.com";

     Window.open(

url,

"_blank", "");

      }

   }

...

....code segment ends......

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