I Solved!! My problem was in a DependecyProperty declaration
private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var selector = (LongListSelector)d;
selector.SelectedItem = e.NewValue;
}
NOT WORKS
WORKS This declaration
private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var selector = (LongListSelector)d;
selector.SetSelectedItem(e);
}
private void SetSelectedItem(DependencyPropertyChangedEventArgs e)
{
base.SelectedItem = e.NewValue;
}