Opening new browsers window blocked inside GWT application

Hello,
In my gwt, when a clickEvent is fired, i create a webapp using rpc
that i deploy on server and i return the url which i used to open a
new window...I have to do some process before opening new window , I
know it's because of that that browsers block the page but I do not
know how to make it functional.

url= someProcess();
Window.open(url, "Test ", "");

is there any tricks to make the popup not blocked? Thanks in advance
for your helps

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