the column click events it may be $-1$ if the user clicked in the list control
header outside any column.
-\membersection{wxListEvent::Cancelled}\label{wxlisteventcancelled}
-
-\constfunc{bool}{Cancelled}{\void}
-
-true if this event is an end edit event and the user cancelled the edit.
-
\membersection{wxListEvent::GetPoint}\label{wxlisteventgetpoint}
\constfunc{wxPoint}{GetPoint}{\void}