I get from the database, date values.
If the values that I get are 1.1.1900, I would like to show an empty cell.
also, it is better if possible, not to change the value itself, but only its display, so that the row
doesnt change its status to edit mode.
any suggestions?
It sounds like your best bet is a DataFilter, since you can control what value the editor sees. For an example of data filters, take a look at the KB.
-Matt