RadAutoCompleteBox provides support for keyboard navigation for the items in the drop-down control.
When a drop-down control is open, the user can navigate over the filtered items with the Up and Down keys , then select the current item by pressing
If a drop-down control is open and the user presses Esc, the drop-down control closes and it preserves the input area unchanged.
The RadAutoCompleteBox control also exposes the AutosuggestFirstItem property that affects the behavior of the keyboard
selection (through the Enter key). The AutosuggestFirstItem property indicates whether the first suggestion item should be highlighted
by default when the drop-down is open.
When this property is set to true and keyboard selection is performed, immediately on drop-down
opening, the highlighted item is selected in the input area;
If the property is set to false, the input area text will be preserved
This code snippet demonstrates how to set the AutosuggestFirstItem property:
<telerikInput:RadAutoCompleteBox x:Name="radAutoCompleteBox" AutosuggestFirstItem="True"/>