protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
{
}

------解决方案--------------------
。。。给你完整的代码
C# code

        protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
        {
            switch (keyData)
            {
                case System.Windows.Forms.Keys.Tab:
                    MessageBox.Show("OK!");
                    return true;
            }
            return base.ProcessCmdKey(ref msg, keyData);
        }

------解决方案--------------------
你的方法设个断点再调试一下  钩子还是少用