fix mat datetime picker regression

demo-shell/src/app/components/overlay-viewer/overlay-viewer.component.html

@@ -1,5 +1,15 @@
 <h1>Overlay Viewer</h1>
 
+<p class="toggle">
+    <mat-slide-toggle
+        id="adf-viewer-overlay"
+        [color]="'primary'"
+        (change)="toggleOverlay()"
+        [checked]="isOverlay">
+        Overlay
+    </mat-slide-toggle>
+</p>
+
 <adf-document-list
     currentFolderId="-my-"
     (preview)="showPreview($event)">
@@ -7,6 +17,6 @@
 
 <adf-viewer
     [(showViewer)]="showViewer"
-    [overlayMode]="true"
+    [overlayMode]="isOverlay"
     [fileNodeId]="nodeId">
 </adf-viewer>

demo-shell/src/app/components/overlay-viewer/overlay-viewer.component.ts

@@ -26,6 +26,11 @@ export class OverlayViewerComponent {
     showViewer = false;
 
     nodeId: string;
+    isOverlay = true;
+
+    toggleOverlay() {
+        this.isOverlay = !this.isOverlay;
+    }
 
     showPreview(event) {
         if (event.value.entry.isFile) {