glue midi parts...

i don´t usually work with midi, so there might be another way to do this, that i´m not aware of, but just now, i tried to use the glue tool, to merge 3 midi parts together, but it didn´t work!
i figured that would be the obvious way to do this, so i tried it several times!
instead, i had to delete each midi part and write new ones, using the draw tool!
bug, or am i wrong about this?

Confirmed, this has been noticed here, selct a midi part, hold down the shift key, use the arrows to select following midi parts, call up the glue tool and only the first two parts glue together.

This is not an issue, but rather a tutorial question. See page 716.