Default - Item is added when the it is clicked or the Enter key is pressed
allowInputOnBlur is set to true - Item is added when it is clicked, the Enter key is pressed, or the input field is blurred
What the input should do when blurred. - 'clear' empties the field (default) - 'add' adds the current value as a multiselect item - 'none' leaves the text
default placeholder when there's no entry yet
This event carries the item that was removed.