FIX. RadCarousel - SelectedItem is not assigned when the control is started.

Resolution: 

Selected Items represents the Clicked by mouse item and this behavior is a desired behavior.

So it should be not populated without user click on an item:

Instead the users should use the SelectedIndexChanged event in order to detect the current item:

        private void radCarousel1_SelectedItemChanged(object sender, EventArgs e)
        {
            currentItem = radCarousel1.Items[radCarousel1.SelectedIndex];
        }