The issue is fixed in the 2015 Q1 SP (2015.1.0401) version of the controls.

Hi,

In order to workaround this issue you could use the SelectionHelper of the RadListBox control and set its SelectItems collection directly. The next code snippet shows the described workaround:

- the XAML declaration:

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
...
<telerik:RadListBox x:Name="radListBox" 
                    ItemsSource="{Binding Items}" 
                    DisplayMemberPath="Name" ></telerik:RadListBox>

- and in the code behind when setting the SelectedItem:

var items = (this.DataContext as ViewModel).Items.OfType<Item>().ToList();
this.radListBox.SelectionHelper.SelectItems(new List<Item> { items[0] });