No roots on dendrobium keiki

[pjoeverett]

The keiki is growing from the end of the stem. It is right in the center of the leaves. Most keikis eventually have roots. I have not seen any roots so how would I repot the new growth? I am also getting several new growths from the outer edges of the plant. Also the growth in the center is leafless and as much as I would like to keep it a specimen plant it does need repotting. The orchid is D. delicatum x J. Christie.