Use the ExpandOnSearch property to expand items while user types characters to search for items using incremental search feature. By default, the ExpandOnSearch property is False. Use the AutoSearch property to enable or disable incremental searching feature. Use the AutoSearch property of the Column object to specify the type of incremental searching being used within the column. The ExpandOnSearch property has no effect when the AutoSearch property is False. Use the exExpandOnSearch type to expand items while user types characters in a drop down editor. For instance, if the ExpandOnSearch property is True, the control fires the BeforeExpandItem event for items that have the ItemHasChildren property is True, when user types characters.