Towards a wxWidgets class hierarchy poster:

Much-used base classes:
* don't include `wxObject', choose a color for that (yellow?)
(* don't include `wxControl', choose a color for that (yellow?))
(* don't include `wxWindow', choose a color for that (green?))

Splitting: (classes become seperate `child' and `parent')
* wxWindow
* wxDialog
* wxControl
* wxFrame

Grouping:
* wxStreamBase
* wxEvent
* wxControl
* wxDialog
* wxGrid
* wxConnectionBase, wxSocketBase, wxSockAddress, wxServerBase
* wxGDIObject

Listing:
* remove wxEvent, make that a list
* remove wxControl, make that a list. remove wxToolBarBase for convenience
* wxCommandEvent exists though

Fixes needed: 
* wxGridell...
* wxNotifyEvent is not a child of wxEvtHandler

Additions needed:
* wxDb??
* wxLog (no parent)
  * wxLogChain
    * wxLogPassThrough
      * wxLogWindow
  * wxLogGui
  * wxLogNull
  * wxLogStderr
  * wxLogStream
  * wxLogTextCtrl

* wxMask, no visible parent, is a wxObject, near wxBitmap and wxMemoryDC
v wxTreeCtrl (is a wxControl)
v wxHtmlWindow (is a wxScrolledWindow)
* wxString (no parent)
* wxStringBuffer (no parent)
* wxStringBufferLength (no parent)
* wxCmdLineParser, no parent
* wxTimeSpan, no parent