Scroll mode specifies grid behavior on scrolling down:

• last-row-on-bottom - default, grid will scroll till last row is shown at the bottom. This behavior is mostly intended for read-only grids. This minimizes scrolling.
• last-row-on-top - grid will scroll till last row is shown at the top. The most common behavior type for the editable grids. This allows user to add new data lines to the grid by just scrolling to the first blank line(s) and filling them up with the new data.
• outside-data - grid will scroll past last row in data. Is intended for a single-lined grids emulating "pages". Each line is a "page" with line's data fields. The user can scroll to the last blank line ("page") to enter new line's data adding a new "page" to the grid by doing this.