protected void WriteBoneParent( BinaryWriter writer, Bone bone, Bone parent )
{
long start_offset = writer.Seek( 0, SeekOrigin.Current );
WriteChunk( writer, SkeletonChunkID.BoneParent, 0 );
WriteUShort( writer, bone.Handle );
WriteUShort( writer, parent.Handle );
long end_offset = writer.Seek( 0, SeekOrigin.Current );
writer.Seek( (int)start_offset, SeekOrigin.Begin );
WriteChunk( writer, SkeletonChunkID.BoneParent, (int)( end_offset - start_offset ) );
writer.Seek( (int)end_offset, SeekOrigin.Begin );
}