TouchScreenKeyboard textfield move focus

How can I move the keyboard focus from one textfield to a different one?

tried like this

 if (some condition)
 {
     GUI.FocusControl("textfield2");
 }

Named the objects:

  GUI.SetNextControlName("textfield2");
  inputText = GUI.TextField(new Rect( ... ), inputText);

On my PC is working fine, from my android tablet is not, the focus is not changing to the next control.

also this problem