fix: add ref to IScheduleTab

src/components/schedule/tabs/tabs.component.html

@@ -1,18 +1,19 @@
 <mat-tab-group dynamicHeight mat-stretch-tabs="false" mat-align-tabs="start" color="accent" class="padding-content"
-               (selectedTabChange)="chooseTabs($event)">
+               #tabGroup
+               (selectedTabChange)="chooseTabs($event.index)">
   <mat-tab label="Группа">
     <div>
-      <app-group (eventResult)="groupSelected($event)"/>
+        <app-group #groupTab (eventResult)="groupSelected($event)"/>
     </div>
   </mat-tab>
   <mat-tab label="Преподаватель">
     <div>
-      <app-professor (eventResult)="professorSelected($event)"/>
+        <app-professor #professorTab (eventResult)="professorSelected($event)"/>
     </div>
   </mat-tab>
   <mat-tab label="Кабинет">
     <div>
-      <app-lecture-hall (eventResult)="lectureHallSelected($event)"/>
+        <app-lecture-hall #lectureHallTab (eventResult)="lectureHallSelected($event)"/>
     </div>
   </mat-tab>
   <!--