title: How to make '3 part' splitter window in wxWidgets?
body: <p>I want to create 3 parts in a window or panel. All the 3 Parts should have possibility to resized by user and be automatically resized when user change size of Main window. Its something like 3 panels added to vertical box sizer, but user can resize all of three parts. I can add up to 2 panels to wxSplitterWindow.</p>
  
  <p>Im working with C++, wxWidgets and wxFormBuilder.</p>