Get pointers to all the items in a list
PtGenListItem_t **PtGenListAllItems( PtWidget_t *widget, PtGenListItem_t **buffer );
This function fills the given buffer with pointers to all the list items.
If buffer is NULL, the function allocates a buffer by calling malloc(), and the buffer is NULL-terminated (or zero-terminated). It's your application's responsibility to free the buffer when it's no longer needed.
If buffer isn't NULL, the function doesn't add a NULL or zero to the end.
A pointer to a buffer containing pointers to all the items in the list, or NULL.