title: Handle Window Pop Up in Selenium
body: <p>I am working with Selenium, now there is a condition: </p>
  
  <p>when I hit a button in my webpage a window pop up opens up. </p>
  
  <p>Now I have to click a radio button (one out of two, it will work even if we send a TAB ) and then click an OK button. I searched in the net and got to know about "<code>driver.getWindowHandle()</code>". </p>
  
  <p>But I don't have any idea dealing with the newly opened window popup. 
  Need help in this.</p>