message: Allow select questions from detail panel in designer,
diff: @@ -2710,6 +2710,11 @@ export class QuestionMatrixDropdownModelBase
  if (!this.generatedVisibleRows) return -1;
  return this.visibleRows.indexOf(row);
  }
  + public getElementsInDesign(includeHidden: boolean = false): Array<IElement> {
  + if (this.detailPanelMode == "none")
  + return super.getElementsInDesign(includeHidden);
  + return includeHidden ? [this.detailPanel] : this.detailElements;
  + }
  hasDetailPanel(row: MatrixDropdownRowModelBase): boolean {
  if (this.detailPanelMode == "none") return false;
  if (this.isDesignMode) return true;
  