[SearchBox is no longer available for use as of Windows 10. Instead, use AutoSuggestBox. ]
Raises an event of the specified type and with additional properties.
var boolean = searchBox.dispatchEvent(type, eventProperties);
The type (name) of the event.
The set of additional properties to be attached to the event object when the event is raised.
true if preventDefault was called on the event, otherwise false.
Minimum WinJS version