Provide an option to close the popup / drop-down when selecting (highlighting) an item. This is in case I do not want to use the OK button to select an item. 

similar to the maui picker control.

If the ListPicker (or any other Picker control) has "DropDown" PickerMode and is placed inside a ScrollView, scrolling with the mouse wheel leaves the dropdown on the same position and away from the picker. With the ComboBox, the dropdown is scrolled together with the control itself.

The behavior happens also when using the AutoComplete control.

I know there is already a SelectedItem property for the RadListPicker, but I would also like a SelectedIndex property

Thank you,

Daniel