How do you select value from RadListBox?

I've tried several things and I've found several different code samples and none of them work. I get a red line under some of the text.
This is for Silverlight 5 by the way.

I tried this code but it doesn't work: radListBox1.Items[1].Text  (I get a red line under Text)

And i get a red line under text in the following as well:
radListBox1.SelectedIndex.Text
radListBox1.SelectedItem.Text

I don't know what else to do

I found this example and it doesn't work either
label1.Content = radListBox1.Items[1].Value;