Disable ListBox Items

[Oliver]

I've got a listBox initialised with the following:

lbxFunction.ItemsSource = Enum.GetValues(typeof(ChartAggregateFunction));

How do I disable certain ListBox items?

I tried:

((RadListBoxItem)lbxFunction.Items[0]).IsEnabled = false;

I get an error.

Any solutions will be appreciated.

[Oliver]

Solved it.

It should be:

((RadListBoxItem)lbxFunction.ItemContainerGenerator.ContainerFromItem(lbxFunction.Items[0])).IsEnabled = false