void SetBreakSequenceCallback (wxBreakSequenceFunction f, void *data)
Installs a callback procedure that is invoked when BreakSequence is called. After it is invoked once, the callback is removed from the keymap. If another callback is installed before BreakSequence is called, the old callback is invoked immediately before the new one is installed.
The form of the callback function f is:
typedef void (*wBreakSequenceFunction) (void *data)
The value of data is passed on to the callback function when it is invoked.