Properties
- IsSorted - Indicates if items added to the List are expected to be sorted
- OnHide - OnHide animation will be played each time the extender's prompt is hidden
- OnShow - OnShow animation will be played each time the extender's prompt is displayed
- PromptCssClass - The name of a CSS class to apply to the prompt message
- PromptPosition - Indicates whether the message should appear at the Top or Bottom of the ListBox. The default is Top
- PromptText - A message to display when the ListBox or DropDownList receives focus
- QueryPattern - Indicates how typed characters should be used in the search query
- QueryTimeout - Indicates whether a search query should be reset after the timeout if no match is found. The default is 0 meaning no auto reset behavior