Hi David,

I'm pasting my reply from the support ticket here:

If you need to use the custom RadListBoxItem when binding the ItemsSource you would need to implement a custom RadListBox and override the following methods:


public class CustomListBox : RadListBox
{
    protected override DependencyObject GetContainerForItemOverride()
    {
        return new CustomListBoxItem();
    }
 
    protected override bool IsItemItsOwnContainerOverride(object item)
    {
        return item is CustomListBoxItem;
    }
}

Regards,
Kalin

As workaround a custom ListBoxItem can be used instead - the TryFocus method should be overridden as shown below:

public class CustomListBoxItem : RadListBoxItem
{
    protected override void TryFocus()
    {
        var focusedElement = FocusManagerHelper.GetFocusedElement(this) as UIElement;
        if (focusedElement == null ||
            !(focusedElement != this &&
            this.IsAncestorOf(focusedElement) &&
            !(focusedElement is RadListBoxItem)))
        {
            this.Focus();
        }
    }
}

Regards,
Kalin