mediarepo/mediarepo-ui/src/app/components/core/core.component.html

<div id="content">
    <mat-tab-group #tabGroup (selectedTabChange)="this.onTabSelectionChange($event)">
        <mat-tab label="Repositories">
            <app-repositories-tab></app-repositories-tab>
        </mat-tab>
        <mat-tab *ngIf="this.selectedRepository" label="Files">
            <app-files-tab></app-files-tab>
        </mat-tab>
        <mat-tab *ngIf="this.selectedRepository" label="Import">
            <app-import-tab></app-import-tab>
        </mat-tab>
    </mat-tab-group>
</div>