void SetGrabMouseFunction (wxGrabMouseFunction f, void *data)
This is the same as SetGrabKeyFunction, but for mouse events instead of keyboard events. The form of the callback function f is:
typedef Bool (*wxGrabMouseFunction) (char *str, wxKeymap *km, wxMediaBuffer *media, wxMouseEvent &event, void *data)
Mouse grab callback functions are de-installed with RemoveGrabMouseFunction.