Each column in the Gridview can be sorted by the user by clicking on the column's Heading.
When a list is first displayed, it is in the order provided by the host application.
The first click on a heading will sort the gridview in ascending order based on the values in the column under the clicked heading.
The second click on a heading will sort in descending order on that column's values.
When the More button is clicked on a gridview that is in a sorted state, the additional rows will be added to the data, then the gridview will be resorted based on the last clicked header.