With the default configuration in our filtering demo you won`t be able to sort the "Line" rows by the "Quantity" values in "M-Class" column. RadPivotGrid allows only columns and rows sorting. Sorting by values in the table itself is not available. You could however use the "Quantity" as row or column fields and then sort by the values.
For more information about RadPivotGrid sorting you could take a look at our online help article "PivotGrid: Basic Sorting
Hope that helps.
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to the blog feed