This is used to set up the default sort orders on the grid columns. This is an XML string and should have a root node value of Columns and child node values of Column for each column for which you want to set up sorting.
The title of the column.
The order (direction) to sort the column in.
Options: Ascending, Descending, Disabled, None
Default: None
Example:
<Columns>
<Column>
<ColumnMember>Priority</ColumnMember>
<SortOrder>descending</SortOrder>
</Column>
<Column>
<ColumnMember>Title</ColumnMember>
<SortOrder>ascending</SortOrder>
</Column>
</Columns>