wxNode * FindChunkAtBlock(long blockId)
For a given block id, returns the position in the text chunks list of the first CHUNK_START_LINE chunk before the block. A wxNode pointer is returned to allow the programmer to efficiently traverse the text chunks list from this point. The data stored in this node is a wxTextChunk object.
This function may not be very useful for programmers; it is mainly for internal use. Normally functions returning and taking block ids are used for manipulating blocks.