5.14: Datepicker Visibility Events example
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**Primary Actor**: User

**Scope**: Ngx-bootstrap DEMO / BS version 3&4

**Goal**: Show user example how to subscribe to datepicker visibility events

Main success scenario:
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1. User opens Datepicker demo page
2. User clicks on Visibility Events sub-menu
3. User see Datepicker input
4. When user clicks on Datepicker input, bs-datepicker-container opens and user see card with "Event onShown is fired"
5. When user chose any date, then bs-datepicker-container disappeared and "Event onShown is fired", "Event onHidden is fired" shown
6. When user clicks on input again, then "Event onShown is fired" shown and "Event onHidden is fired" hidden

Variations:
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2*. User scroll to Visibility Events sub-menu