private void ScrollingHost_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
var scrollingHost = Stickers.ItemsPanelRoot as ItemsWrapGrid;
if (scrollingHost != null && Pivot.SelectedIndex == 2)
{
var first = Stickers.ContainerFromIndex(scrollingHost.FirstVisibleIndex);
if (first != null)
{
var header = Stickers.GroupHeaderContainerFromItemContainer(first) as GridViewHeaderItem;
if (header != null && header != Toolbar.SelectedItem)
{
Toolbar.SelectedItem = header.Content;
Toolbar.ScrollIntoView(header.Content);
}
}
}
}