Hi Adam ,
First of all I want to apologize for the delayed answer.
Regarding the Text binding - RadComboBox will automatically update its Text property with the entered text on each keystroke. However, if TextSearch is enabled, the control will autocomplete the entered text with the text of the first matching item, e.g. if you have the following items:
and you begin typing "it", the Text property will become "item 1". If you type "aaa", the Text will be "aaa".
To disable the autocomplete you need to set IsTextSearchEnabled = false on RadComboBox.
the Telerik team