MDI窗体中，子窗体最大化后，如何不显示图标和最大化等按钮
即使将子窗体的MaxBox.MinBox,ControlBox,FormBorderStyle这些属性都设为False和NONE,子窗体最大化后，都会在MDI父窗体上显示图标和关闭，最小化，恢复大小等按钮。如何使它们消失？

------解决方案--------------------
屏蔽相应的系统消息

1. 先定义
public const int WM_GETTEXT = 0x000D; //WM_GETTEXT Message value is 0x000D.Hide Icon of Child Form when it Maxmized

2. 重载WndProc函数

protected override void WndProc(ref Message m)
{
if (m.Msg == WM_GETTEXT)
AdjustMenuItem();
else
base.WndProc(ref m);
}

3. 调整菜单的次序

private void AdjustMenuItem()
{
if (this.WindowState == FormWindowState.Maximized)
{
if (!(this.MdiParent.MainMenuStrip == null))
{
if (this.MdiParent.MainMenuStrip.Items.Count > (this.MdiParent as MainForm).OriginalMenuItemCount)
{
if (this.MdiParent.MainMenuStrip.Items[0].Alignment == ToolStripItemAlignment.Left)
{
if(this.MdiParent.MainMenuStrip.Items[0].Visible)
this.MdiParent.MainMenuStrip.Items[0].Visible = false;
}
}
}
}
}