Enyo 1362: added "detach" button in preview

* ENYO-1362: added "detach" button in preview. (HEAD, origin/ENYO-1362, ENYO-1362)

Warning: this branch must be merged *after* ENYO-1710

Enyo-DCO-1.1-Signed-off-by: Dominique Dumont <dominique.dumont@hp.com>