_focusRecentlyUsedControl() {
      if (!this._recentlyFocused || !Object.keys(this._recentlyFocused).length) {
        return;
      }
      const recentlyFocusedSelectedItems = this._recentlyFocused.getSelectedItems();
      if (recentlyFocusedSelectedItems.length) {
        recentlyFocusedSelectedItems[0].focus();
      }
    }
Sets focus on recently used control within the dialog.