title: dispatchKeyEvent doesn't effect to EditText inside PopupWindow
body: <p>I have popup window that contains some EditTexts. I want to create my custom numerical keyboard inside the popup window. So I have 10 buttons that represent digits 0-9. Inside buttons' onClickListener I trying to dispatch key event</p>
  
  <pre><code>public void onClick(View v) {
      dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_0));
  }
  </code></pre>
  
  <p>but it doesn't effect to EditTexts. I tried to do it with focusable equals true and false, but the result is the same. When I am trying to dispatch key event in the main layout of activity it works well, so what I should change to make my code work inside popup window?</p>