Let's say we have an grid with incell editing and navigation enabled. But also there may be some column which are readonly (non editable ). Currently when I press the tab from an editable cell it focus on non editable cell's ,which is no needed. I'll prefer to have a navigation which is stopping only at the editable cells when I press the tab. And also I would like to add new row when I press the tab form last editable cell in the last row.