title: onBackPressed() doesn't trigger when showing ProgressDialog
body: <p>I have tried a lot of ways to trigger the <code>backPressed</code>() event when the <code>progressDialog</code> is displayed. But none works. If I provide <code>progDialog.setcancelable(true);</code> I am able to dismiss the <code>progressDialog</code> but still the <code>onBackPressed</code>() doesn't get triggered.  </p>