By default, the TimePicker value is
null and the TimeSelector popup is hidden.
The TimePicker provides options for:
To set the initial value that is rendered by the TimePicker, set the
defaultValue property. This approach allows the component to display a value upon its initial render while remaining in an uncontrolled state.
To display a popup for the time selector when the TimePicker initially renders, set the
defaultShow property to
true. This approach allows the component to show an open popup for the time selector while remaining in an uncontrolled state.