You can get the link to the ScrollViewer from the GridView template using VisualTreeHelper. You can also use some helper methods that I put in the WinRT XAML Toolkit - in VisualTreeHelperExtensions . You just need to add
using WinRTXamlToolkit.Extensions;
then call
var scrollViewer = myGridView.GetFirstDescendantOfType<ScrollViewer>()
and there you go.
EDIT * - note that the namespace was changed in later versions of the toolkit for WinRTXamlToolkit.Controls.Extensions.
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