如何在angular中展开基于单击按钮的mat扩展面板？

import { MatExpansionModule } from '@angular/material/expansion';

@NgModule({
  imports: [
    // ...
    MatExpansionModule
  ],
  // ...
})
export class AppModule { }

<mat-accordion>
  <mat-expansion-panel>
    <mat-expansion-panel-header>
      <mat-panel-title>
        按钮标题
      </mat-panel-title>
      <mat-panel-description>
        描述
      </mat-panel-description>
    </mat-expansion-panel-header>

    <!-- 面板内容 -->
    <p>这里是面板的内容</p>
  </mat-expansion-panel>
</mat-accordion>

<mat-accordion>
  <mat-expansion-panel [expanded]="isExpanded">
    <mat-expansion-panel-header>
      <mat-panel-title>
        按钮标题
      </mat-panel-title>
      <mat-panel-description>
        描述
      </mat-panel-description>
      <button mat-button (click)="isExpanded = !isExpanded">
        展开/折叠
      </button>
    </mat-expansion-panel-header>

    <!-- 面板内容 -->
    <p>这里是面板的内容</p>
  </mat-expansion-panel>
</mat-accordion>

export class YourComponent implements OnInit {
  isExpanded = false;

  // ...
}