import { MatButtonModule } from '@angular/material/button';
import { FlexLayoutModule } from '@angular/flex-layout';
import { MatCardModule } from '@angular/material/card';
+import { MatTooltipModule } from '@angular/material/tooltip';
const routes:Routes = [
{path: 'policy', component: PolicyControlComponent}
MatSortModule,
MaterialDesignFrameworkModule,
MatTableModule,
+ MatTooltipModule,
ReactiveFormsModule,
RouterModule.forChild(routes)
],