fix

ui/hv2-ui/src/app/messages/messages.component.html

@@ -1,11 +1,24 @@
 <section class="mat-typography">
-    <mat-card class="defaultCard" *ngIf="messageService.messages.length">
+    <mat-card class="defaultCard">
         <mat-card-header>
             <mat-card-title>Messages</mat-card-title>
         </mat-card-header>
         <mat-card-content>
-            <button (click)="messageService.clear()">clear</button>
+            <mat-accordion>
+                <mat-expansion-panel (opened)="collapse = true"
+                                    (closed)="collapse = false">
+                    <mat-expansion-panel-header>
+                        <mat-panel-title *ngIf="!collapse">
+                            Übersicht
+                        </mat-panel-title>
+                        <mat-panel-description>
+                        </mat-panel-description>
+                    </mat-expansion-panel-header>
+                <button (click)="messageService.clear()">clear</button>
             <div *ngFor='let message of messageService.messages'> {{message}} </div>
+        </mat-expansion-panel>
+    </mat-accordion>
+    
         </mat-card-content>
     </mat-card>
 </section>

ui/hv2-ui/src/app/messages/messages.component.ts

@@ -8,6 +8,8 @@ import { MessageService } from '../message.service';
 })
 export class MessagesComponent implements OnInit {
 
+  collapse: boolean = false
+  
   constructor(public messageService: MessageService) { }
 
   ngOnInit(): void {