[Key or key combination] TAB [Description] 
If the current cell is in edit mode, moves the focus to the next cell in the current row. If the focus is already in the last cell of the row, commits any changes that were made and moves the focus to the first cell in the next row. If the focus is in the last cell in the control, moves the focus to the next control in the tab order of the parent container. If the current cell is not in edit mode, moves the focus to the next control in the tab order of the parent container.