The log targets can also be combined: for example you may wish to redirect the
messages somewhere else (for example, to a log file) but also process them as
-normally. For this the \helpful{wxLogChain}{wxlogchain} and
-\helpful{wxLogPassThrough}{wxlogpassthrough} can be used.
+normally. For this the \helpref{wxLogChain}{wxlogchain} and
+\helpref{wxLogPassThrough}{wxlogpassthrough} can be used.