I want to show list of cities to the user loaded in the combobox. If there city is not found they need to enter the city name in the combobox itself. How the user can enter a new item in the combobox?
You can set the AllowCutomText property to True in order to allow the user to type the text in combobox and you for adding the new item, simply call the Add() method of the item. Checkout the online demo for more information: Add/Remove/Disable Items