摘要：
http://social.msdn.microsoft.com/Forums/vstudio/en-US/8cf60e57-6d97-43c6-bb3a-394b9bf130af/the-toolstripmenuitem-visible-value-always-false?forum=csharpgeneraluseToolStripMenuItem.Availableproperty instead ofToolStripMenuItem.Visible 阅读全文