2.8: Buttons Disabled example
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**Primary Actor**: User

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

**Goal**: Show user disabled buttons example

Main success scenario:
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1. User opens Buttons demo page
2. User clicks on Disabled Buttons sub-menu
3. User see 2 buttonss: primary button "Button" and warning button "Enable/Disable"
4. By default, "Button" is enabled and user is able to click on each
5. When user clicks on "Enable/Disable", "Button" become disabled and unclickable
6. When user clicks on "Enable/Disable" second time, "Button" become enabled and clickable

Variations:
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2*. User scrolls to Disabled Buttons sub-menu