Sets the specified logger (which may be NULL) as the default log target but the log messages are also passed to the previous log target if any.
Detaches the old log target so it won't be destroyed when the wxLogChain object is destroyed.
Returns the pointer to the previously active log target (which may be NULL).
Returns true if the messages are passed to the previously active log target (default) or false if PassMessages() had been called.
By default, the log messages are passed to the previously active log target.
Sets another log target to use (may be NULL).