-// We need a HWND to create a taskbar icon, so create a special hidden window
-// just to be able to use its HWND.
+// NB: this class serves two purposes:
+// 1. win32 needs a HWND associated with taskbar icon, this provides it
+// 2. we need wxTopLevelWindow so that the app doesn't exit when
+// last frame is closed but there still is a taskbar icon