wxWindow (and therefore all window classes) are derived from
this class.
+When events are received, wxEvtHandler invokes the method listed in the
+event table using itself as the object. When using multiple inheritance
+it is imperative that the wxEvtHandler(-derived) class be the first
+class inherited such that the "this" pointer for the overall object
+will be identical to the "this" pointer for the wxEvtHandler portion.
+
\wxheading{Derived from}
\helpref{wxObject}{wxobject}