MdiChildren有個BUG

               private int count = 0;              private void menuItem3_Click(object sender, System.EventArgs e)              {                     Form form = new Form();                     form.Text = (this.count++).ToString();                     form.MdiParent = this;                     form.Closed += new EventHandler(form_Closed);                     form.Show();              }               private void Form1_MdiChildActivate(object sender, System.EventArgs e)              {                     this.menuItem1.MenuItems.Clear();                     foreach(Form form in this.MdiChildren)                     {                            this.menuItem1.MenuItems.Add(form.Text);                     }              } 

MdiChildren有個BUG，但有表單關閉後，它的值總還比實際還在開啟的表單個數多一個。最近關閉的表單沒有從MdiChildren中移除，在Form的Closed事件後也沒移除，我要在什麼時候才能得到實際剩餘表單呀？？？？