void SetKeymap (wxKeymap *keymap = NULL)
Sets the current keymap for the buffer. NULL indicates that no key
mapping should take place. The usage of the former and new keymaps are
adjusted appropriately (see
wxKeymap::AdjustUsage (section 
)); if the
former keymap for this buffer is not used by anyone else, it will
be deleted. Similarly, the new keymap will be deleted when the
buffer is destroyed, unless someone else is using the keymap at that
time.