Here is how it works. You have a property CanAutoCompleteSelectItems
which is true by default for IsEditable
RadComboBox. That is why the item is selected when autocomplete(note that this property works only if the drop down is opened) and if there are multiple items starting with the entered text it is always selecting the first one. That is why even when you delete the "a" you are still selected Pavlova(it is the first item starting with P). In order to clear the selection you have to delete the whole Text.
What exactly is your scenario? have you tried to use IsFiltering= true
to filter the items.
All the best,
the Telerik team
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