fix(igxHierarchicalGrid): Ensure root hierarchical grid takes only di… (#13777)

Author: MayaKirova

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts

@@ -4,6 +4,7 @@ import {
     ChangeDetectionStrategy,
     ChangeDetectorRef,
     Component,
+    ContentChild,
     ContentChildren,
     CUSTOM_ELEMENTS_SCHEMA,
     DoCheck,
@@ -63,6 +64,7 @@ import { IgxColumnMovingDropDirective } from '../moving/moving.drop.directive';
 import { IgxGridDragSelectDirective } from '../selection/drag-select.directive';
 import { IgxGridBodyDirective } from '../grid.common';
 import { IgxGridHeaderRowComponent } from '../headers/grid-header-row.component';
+import { IgxActionStripComponent } from '../../action-strip/action-strip.component';
 
 let NEXT_ID = 0;
 
@@ -405,6 +407,10 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
      */
     public childRow: IgxChildGridRowComponent;
 
+    /** @hidden @internal */
+    @ContentChild(IgxActionStripComponent, { read: IgxActionStripComponent, descendants: false } )
+    public override actionStrip: IgxActionStripComponent;
+
     private _data;
     private h_id = `igx-hierarchical-grid-${NEXT_ID++}`;
     private childGridTemplates: Map<any, any> = new Map();