ListItemCollection.AddRange sets selection to the first item

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I have a custom DropDownList derived from System.Web.UI.WebControls.DropDownList.
And I've noticed that after populating data using ListItemCollection.AddRange Method, the DropDownList.SelectedIndex Property becomes set to 0 from -1.

I consider this as an unexpected behavior and have to change it back to -1- unselected.

            Items.Clear();

            Debug.Assert(SelectedIndex == -1);

            Items.AddRange(cachedItems);

            Debug.Assert(SelectedIndex == 0);//is it correct?