1) double click on a metadata cell, makes it go in edition
if content is editable and lockable, then it is locked
2) if edition is canceled, lock is removed
3) if edition ends normally, the cell is "dirty", and a save bar appears
4) the focus is set on the next row
5) if the whole edition is canceled, lock are removed
6) if the whole edition is saved, editcontentfunction will save it (creating a metadataset on the fly)
7) search tool is outofdate