关闭NavigatorBar后能否再显示吗？

private void frmMain_KeyDown(object sender, KeyEventArgs e)
{
   //必须设窗体的KeyPreview=True，捕获KeyDown事件!
   //this.KeyPreview = true;
   
   if (e.KeyCode == Keys.F12)
   {
      if (dockPanel1.Visibility != DockVisibility.Visible)
      dockPanel1.Visibility = DockVisibility.Visible;
      else
      dockPanel1.Visibility = DockVisibility.Hidden;
   }
}

// 来源:www.CSFramework.com, C/S结构框架学习网