message: Fix panel.dispose(),
diff: @@ -1504,14 +1504,16 @@ export class PanelModelBase extends SurveyElement
  }
  public dispose() {
  super.dispose();
  + if (this.rows) {
  + for (var i = 0; i < this.rows.length; i++) {
  + this.rows[i].dispose();
  + }
  + this.rows.splice(0, this.rows.length);
  + }
  for (var i = 0; i < this.elements.length; i++) {
  this.elements[i].dispose();
  }
  this.elements.splice(0, this.elements.length);
  - for (var i = 0; i < this.rows.length; i++) {
  - this.rows[i].dispose();
  - }
  - this.elements.splice(0, this.rows.length);
  }
  }
  