Instead of the control expanding vertically to accomodate all entries, they should be positioned on a single line.

Instead of having the property to select single or multiple it would be more productive to have a property called SelectCount and we can enter the amount of listings to be selected. If its a single I select 1... for multiple I select how many I need. No more need for the Single/Multiple property except for backward compatibility.

I'm using ASP.Net AJAX RadAutoCompleteBox contrl. I can go throught the filtered items with 'up' and 'down' keys, but i want to select an item with 'TAB' key, is that possible? 

RadAutoCompleteBox needs a Delay option to delay the retrieval of data while user is typing - in milliseconds.