Demo pre-populating rows

[pnowak]

uses the non-existing methods and causes an error when trying to edit more cells at once (using copy / paste).

[AMBudnik]

It looks like it works fine in v 4.0.0. Can you check that in your spare time @pnowak ?

[pnowak]

We must balance the versions, because on PRO all the time is this error.