Thanks. It works great for me :)

But don't forget about mine =)

With the help of mleevisiphor and Chandradeep from the support i came to a solution that solved my problem. Here's the code i used:

        function KeyDown(gridName, cellId, key)
        {
                var grid = igtbl_getGridById(gridName);
                var cell = igtbl_getCellById(cellId);

                if((cell.Index == (grid.Bands[0].Columns.length - 1)) && key == 13)
                      var aNovaRow = cell.getRow().commit();
                      aNovaRow = aNovaRow.getNextRow(true);
                      var aNovaCelula = aNovaRow.getCell(0);
                      aNovaCelula.activate();

        }

Thank you all for the help! 

I started playing with the CSOM events provided for the webcombo

MLongin said:

So I started trying this route, and realized I also use webcombos that seem to have non fully implemented onkeydown events.  When the event is fired, the keycode is not passed.  Anyway to determine which keycode is fired in a webcombo?

The best I can come up as an idea would be to study the rendered html of a WebCombo and try to add the onkeydown to something in the rendered html. How are you hooking up to the onkeydown event right now?