Bootstrap theming sample issues

[MayaKirova]

Open the theming sample at:
https://staging.infragistics.com/products/ignite-ui-angular/angular/components/themes/misc/bootstrap-theming#demo

• Expanding the Accordion items below show data, but then hides it and shows as empty:

• Also the topic and screenshots include a theming button, but I don't see one in the actual sample.