Hello Dominik,

Actually, we decided to introduce a HighlightedIndex property which you can use to manually change the highlighted item upon button click. This would now work for both the Page Up and Page Down keys as well as the Home and End keys and also give users the ability to customize the number of items to be scrolled. Here's an example of how the new property can be used:

    public class CustomAutoCompleteBox : RadAutoCompleteBox
    {
        protected override bool HandleKeyDown(Key systemKey)
        {
            if (systemKey == Key.PageDown)
            {
                this.HighlightedIndex += 10;
                return true;
            }

            if (systemKey == Key.PageUp)
            {
                this.HighlightedIndex -= 10;
                return true;
            }

            return base.HandleKeyDown(systemKey);
        }
    }

Regards,
Dilyan Traykov
Progress Telerik

Hello Dominik,

Thank you for your feedback.

Indeed, such a feature seems reasonable and I have thus added this item to our internal backlog so we can prioritize it and plan it in the future. Please follow the item to get notified about any changes in its status.

Regards,
Dilyan Traykov
Progress Telerik