demo/src/app/components/+collapse/demos/toggle-manual/toggle-manual.html
<button type="button" class="btn btn-primary" (click)="collapse.show()"
aria-controls="collapseManual">Show content
</button>
<button type="button" class="btn btn-primary" (click)="collapse.hide()"
aria-controls="collapseManual">Hide content
</button>
<hr>
<div id="collapseManual" #collapse="bs-collapse" [collapse]="isOpen"
class="card card-block card-header">
<div class="well well-lg">Some content</div>
</div>