9.16: Popover Popover context example
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**Primary Actor**: User

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

**Goal**: Show user how make popovers with custom context

Main success scenario:
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1. User opens Popover demo page
2. User clicks on Popover context sub-menu
3. User see clickable button "Open popover with custom context"
4. When user clicks on "Open popover with custom context", then popover-container appear above the button with specific text
5. When user clicks on "Open popover with custom context" again, then popover-container disappeared
6. Component src should be written with context variable, which used in the template as a value for popover

Variations:
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2*. User scroll to Popover context sub-menu