C# MDI窗口中,如何启用Ctrl+C,Ctrl+V等功能

如题, Winform编程中遇到的问题,

这个表单以普通实例Show出来时候,Ctrl+C这些操作都完全正常,但以MDI窗体实例出来后,再按任何键都没用了,
网上搜了好多,都没有找到解决方法.

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没遇到过这种情况，能说具体点吗？比如你是用什么控件，Ctrl+C操作什么控件的数据。

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是不是MDI的父窗体截获了快捷键？

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在Datagridview中无法用Ctrl+C这些,但点右键的菜单没有问题.
MDI父窗体没有写键盘事件.

父窗体的代码如下:
string str = "myapp.form1";
Type myFormType = Type.GetType(str);
Form myForm = (Form)Activator.CreateInstance(myFormType, true);
myForm.MdiParent = this;
myForm.Show();

如果我在父窗体中这样写:
form1 myForm = new form1();
myForm.Show();

就没有问题.

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将上面那名  myForm.MdiParent = this; 注释掉后,按Ctrl+C这些也没有问题了.

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补充一下,我找到有如下资料:
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/451871ac-bc88-4c71-a840-386c21d8125e

I had tried with the solution provided by you above but it is not solving mine issue. On MDI Child Form, Cut, Copy and Paste is not working. I had written these lines of codes in my MDI Parent. Does we need to write something else to activate the keyboard shortcuts for these functionality.

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lPar