If you set the SelectedIndex after an item is added in the Items or ItemsSource of RadListBox, the selection doesn't work.
To work this around, use the SelectedItem property instead of SelectedIndex.
Available in LIB version 2018.1.205, it will be also available in the R1 2018 SP2 Release.
As a workaround, the ScrollingSettingsBehavior.ScrollStep attached property of the RadListBox control can be set to a value equal to that of the Height of the RadListBoxItems. Available in R3 2017 Official Release Version.
Can be reproduced when RadListBox is placed inside a Grid, a StackPanel with horizontal orientation or a WrapPanel. Available in LIB version 2016.1.125, it will be also available in the 2016 Q1 SP1.
Available in the 2016 Q1 Release.
The "auto scroll into the view on selection" functionality does not to work as expected if the ItemsPanel is changed and a selection was previously done.
Available in LIB version 2016.1.321, it will be also available in the 2016 Q2 Release.
Available in R3 2017 Official Release Version.
Available in LIB version 2015.3.1019, it will be also available in the 2015 Q3 SP1. Fix provided by the new IsScrollIntoViewEnabled property.
Available with the R3 2016 SP1 release.
For example if there are the following items: "Item", "Item 2", "Item 3" when the RadListBox has the focus typing "Item 2" does not highlight the corresponding item in the ListBiox control. Available in LIB version 2016.2.525, it will be also available in the 2016 R2 SP1 release.