title: How to group several wxFrame-windows making them to be activated together
body: <p>I need to make activation (i.e. putting on top) of a one <code>wxFrame</code> window trigger activation of a second (and visa versa) for both Windows and Mac.</p>
  <p>I think the main problem here is the Mac, since it seems there's no way to activate specific window programmatically (am I wrong here?).</p>
  <p>When I try to put both windows into a parent container on Mac (changing <code>wxFrame</code>s into <code>wxWindow</code>s), the their borders and title bars disappear.</p>
  <p>Is there an easy way to solve the problem?</p>