5.18: Datepicker Trigger by isOpen property example
===================================================
**Primary Actor**: User

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

**Goal**: Show user example how to trigger datepicker by changing isOpen property

Main success scenario:
----------------------
1. User opens Datepicker demo page
2. User clicks on Trigger by isOpen property sub-menu
3. User see Datepicker input and clickable button "Toggle"
4. When user clicks on "Toggle", then bs-datepicker-container opens
5. When user select any date from this Datepicker, then bs-datepicker-container disappeared and date is shown in format "mm/dd/yyyy"
6. When user clicks on "Toggle" again, then bs-datepicker-container opens again
7. When user clicks on "Toggle" again, then bs-datepicker-container disappear

Variations:
-----------
2*. User scroll to Trigger by isOpen property sub-menu