this depends on what kind of editor you want to create? As you may have read in the documentation, every cell editor comes with a painter. So you may want to add a custom painter to your custom cell editor. And you need to register your custom cell editor to the UiBindingRegistry like this
so your editor will be activated on mouse click.
There is also a cell editor that is yet undocumented as it is not officially released. The PasswordCellEditor with a PasswordTextPainter. Just in case you need something like that.